391050625 has 45 divisors (see below), whose sum is σ = 573512511. Its totient is φ = 265776000.

The previous prime is 391050613. The next prime is 391050629. The reversal of 391050625 is 526050193.

The square root of 391050625 is 19775.

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

It can be written as a sum of positive squares in 7 ways, for example, as 382241601 + 8809024 = 19551^2 + 2968^2 .

It is not a de Polignac number, because 391050625 - 2⁵ = 391050593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391050629) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 3460569 + ... + 3460681.

Almost surely, 2^391050625 is an apocalyptic number.

391050625 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

391050625 is the 19775-th square number.

391050625 is the 9888-th centered octagonal number.

It is an amenable number.

391050625 is a deficient number, since it is larger than the sum of its proper divisors (182461886).

391050625 is an frugal number, since it uses more digits than its factorization.

391050625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 31.

The cubic root of 391050625 is about 731.2698389923.

Multiplying 391050625 by its product of nonzero digits (8100), we get a square (3167510062500 = 1779750²).

The spelling of 391050625 in words is "three hundred ninety-one million, fifty thousand, six hundred twenty-five".