351640725 has 12 divisors (see below), whose sum is σ = 581379456. Its totient is φ = 187541680.

The previous prime is 351640703. The next prime is 351640739. The reversal of 351640725 is 527046153.

It is not a de Polignac number, because 351640725 - 2⁵ = 351640693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2344197 + ... + 2344346.

It is an arithmetic number, because the mean of its divisors is an integer number (48448288).

Almost surely, 2^351640725 is an apocalyptic number.

It is an amenable number.

351640725 is a deficient number, since it is larger than the sum of its proper divisors (229738731).

351640725 is a wasteful number, since it uses less digits than its factorization.

351640725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4688556 (or 4688551 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 351640725 is about 18752.0858839757. The cubic root of 351640725 is about 705.8293644763.

Adding to 351640725 its reverse (527046153), we get a palindrome (878686878).

The spelling of 351640725 in words is "three hundred fifty-one million, six hundred forty thousand, seven hundred twenty-five".