31842521 has 2 divisors, whose sum is σ = 31842522. Its totient is φ = 31842520.

The previous prime is 31842467. The next prime is 31842571. The reversal of 31842521 is 12524813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26666896 + 5175625 = 5164^2 + 2275^2 .

It is a cyclic number.

It is not a de Polignac number, because 31842521 - 2²² = 27648217 is a prime.

It is a super-2 number, since 2×31842521² = 2027892287270882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31842571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15921260 + 15921261.

It is an arithmetic number, because the mean of its divisors is an integer number (15921261).

Almost surely, 2^31842521 is an apocalyptic number.

It is an amenable number.

31842521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31842521 is an equidigital number, since it uses as much as digits as its factorization.

31842521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 31842521 is about 5642.9177736345. The cubic root of 31842521 is about 316.9585572110.

The spelling of 31842521 in words is "thirty-one million, eight hundred forty-two thousand, five hundred twenty-one".