405639297159121 has 3 divisors (see below), whose sum is σ = 405639317299611. Its totient is φ = 405639277018632.

The previous prime is 405639297159101. The next prime is 405639297159181. The reversal of 405639297159121 is 121951792936504.

The square root of 405639297159121 is 20140489.

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., 341937828216721 + 63701468942400 = 18491561^2 + 7981320^2 .

It is not a de Polignac number, because 405639297159121 - 2⁷ = 405639297158993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405639297159101) 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, 10070245 + ... + 30210733.

It is an arithmetic number, because the mean of its divisors is an integer number (135213105766537).

Almost surely, 2^{405639297159121} is an apocalyptic number.

405639297159121 is the 20140489-th square number.

405639297159121 is the 10070245-th centered octagonal number.

It is an amenable number.

405639297159121 is a deficient number, since it is larger than the sum of its proper divisors (20140490).

405639297159121 is an frugal number, since it uses more digits than its factorization.

405639297159121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40280978 (or 20140489 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 64.

The spelling of 405639297159121 in words is "four hundred five trillion, six hundred thirty-nine billion, two hundred ninety-seven million, one hundred fifty-nine thousand, one hundred twenty-one".