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BaseRepresentation
bin1101001111100011010100…
…10011101011001111000001
310211010000002200102121201021
412213301222103223033001
512304112130410401401
6141534150131305441
76063653633064424
oct647615223531701
9124100080377637
1029121661809601
119308477989449
123323b8174b281
13133321272537a
147296d2c6d9bb
153577c43762a1
hex1a7c6a4eb3c1

29121661809601 has 9 divisors (see below), whose sum is σ = 30091546614753. Its totient is φ = 28182091470660.

The previous prime is 29121661809521. The next prime is 29121661809659. The reversal of 29121661809601 is 10690816612192.

The square root of 29121661809601 is 5396449.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 29121661809601 - 29 = 29121661809089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29121661809671) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 167202880 + ... + 167376958.

It is an arithmetic number, because the mean of its divisors is an integer number (3343505179417).

Almost surely, 229121661809601 is an apocalyptic number.

29121661809601 is the 5396449-th square number.

29121661809601 is the 2698225-th centered octagonal number.

It is an amenable number.

29121661809601 is a deficient number, since it is larger than the sum of its proper divisors (969884805152).

29121661809601 is an frugal number, since it uses more digits than its factorization.

29121661809601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348220 (or 174110 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 52.

The spelling of 29121661809601 in words is "twenty-nine trillion, one hundred twenty-one billion, six hundred sixty-one million, eight hundred nine thousand, six hundred one".