31141521 has 12 divisors (see below), whose sum is σ = 45039540. Its totient is φ = 20734560.

The previous prime is 31141511. The next prime is 31141529. The reversal of 31141521 is 12514113.

31141521 is a `hidden beast` number, since 3 + 1 + 141 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25553025 + 5588496 = 5055^2 + 2364^2 .

It is not a de Polignac number, because 31141521 - 2⁵ = 31141489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31141494 and 31141503.

It is not an unprimeable number, because it can be changed into a prime (31141529) 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, 7495 + ... + 10883.

It is an arithmetic number, because the mean of its divisors is an integer number (3753295).

Almost surely, 2^31141521 is an apocalyptic number.

It is an amenable number.

31141521 is a deficient number, since it is larger than the sum of its proper divisors (13898019).

31141521 is a wasteful number, since it uses less digits than its factorization.

31141521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4416 (or 4413 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 31141521 is about 5580.4588521017. The cubic root of 31141521 is about 314.6153733293.

Adding to 31141521 its reverse (12514113), we get a palindrome (43655634).

The spelling of 31141521 in words is "thirty-one million, one hundred forty-one thousand, five hundred twenty-one".