391131414025 has 81 divisors (see below), whose sum is σ = 543570180853. Its totient is φ = 278980662400.

The previous prime is 391131413999. The next prime is 391131414133. The reversal of 391131414025 is 520414131193.

The square root of 391131414025 is 625405.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1141155961 + 389990258064 = 33781^2 + 624492^2 .

It is a de Polignac number, because none of the positive numbers 2^k-391131414025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 2854973757 + ... + 2854973893.

Almost surely, 2^391131414025 is an apocalyptic number.

391131414025 is the 625405-th square number.

391131414025 is the 312703-rd centered octagonal number.

It is an amenable number.

391131414025 is a deficient number, since it is larger than the sum of its proper divisors (152438766828).

391131414025 is an equidigital number, since it uses as much as digits as its factorization.

391131414025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 391131414025 in words is "three hundred ninety-one billion, one hundred thirty-one million, four hundred fourteen thousand, twenty-five".