331121525 has 12 divisors (see below), whose sum is σ = 469246752. Its totient is φ = 227054640.

The previous prime is 331121521. The next prime is 331121537. The reversal of 331121525 is 525121133.

It is a happy number.

It is not a de Polignac number, because 331121525 - 2² = 331121521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 331121525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331121521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 945887 + ... + 946236.

It is an arithmetic number, because the mean of its divisors is an integer number (39103896).

Almost surely, 2^331121525 is an apocalyptic number.

331121525 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

331121525 is a deficient number, since it is larger than the sum of its proper divisors (138125227).

331121525 is a wasteful number, since it uses less digits than its factorization.

331121525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892140 (or 1892135 counting only the distinct ones).

The product of its digits is 900, while the sum is 23.

The square root of 331121525 is about 18196.7449012179. The cubic root of 331121525 is about 691.8242875564.

Adding to 331121525 its reverse (525121133), we get a palindrome (856242658).

The spelling of 331121525 in words is "three hundred thirty-one million, one hundred twenty-one thousand, five hundred twenty-five".