391574326081 has 15 divisors (see below), whose sum is σ = 401100451941. Its totient is φ = 382273670064.

The previous prime is 391574326051. The next prime is 391574326097. The reversal of 391574326081 is 180623475193.

The square root of 391574326081 is 625759.

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

It can be written as a sum of positive squares in 2 ways, for example, as 148564764481 + 243009561600 = 385441^2 + 492960^2 .

It is not a de Polignac number, because 391574326081 - 2¹⁹ = 391573801793 is a prime.

It is a super-2 number, since 2×391574326081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391574326021) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 4399711485 + ... + 4399711573.

It is a 1-persistent number, because it is pandigital, but 2⋅391574326081 = 783148652162 is not.

Almost surely, 2^391574326081 is an apocalyptic number.

391574326081 is the 625759-th square number.

391574326081 is the 312880-th centered octagonal number.

It is an amenable number.

391574326081 is a deficient number, since it is larger than the sum of its proper divisors (9526125860).

391574326081 is an frugal number, since it uses more digits than its factorization.

391574326081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

Multiplying 391574326081 by its sum of digits (49), we get a square (19187141977969 = 4380313²).

The spelling of 391574326081 in words is "three hundred ninety-one billion, five hundred seventy-four million, three hundred twenty-six thousand, eighty-one".