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61105489 = 78172
BaseRepresentation
bin1110100100011…
…0010101010001
311020222110222021
43221012111101
5111120333424
610021411441
71341250054
oct351062521
9136873867
1061105489
1131546505
1218569b81
13c8761c3
148188a9b
1555704e4
hex3a46551

61105489 has 3 divisors (see below), whose sum is σ = 61113307. Its totient is φ = 61097672.

The previous prime is 61105487. The next prime is 61105493. The reversal of 61105489 is 98450116.

The square root of 61105489 is 7817.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 140625 + 60964864 = 375^2 + 7808^2 .

It is not a de Polignac number, because 61105489 - 21 = 61105487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61105481) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3909 + ... + 11725.

Almost surely, 261105489 is an apocalyptic number.

61105489 is the 7817-th square number.

61105489 is the 3909-th centered octagonal number.

It is an amenable number.

61105489 is a deficient number, since it is larger than the sum of its proper divisors (7818).

61105489 is an frugal number, since it uses more digits than its factorization.

61105489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15634 (or 7817 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The cubic root of 61105489 is about 393.8765041076.

The spelling of 61105489 in words is "sixty-one million, one hundred five thousand, four hundred eighty-nine".

Divisors: 1 7817 61105489