31002161 has 2 divisors, whose sum is σ = 31002162. Its totient is φ = 31002160.

The previous prime is 31002157. The next prime is 31002197. The reversal of 31002161 is 16120013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23814400 + 7187761 = 4880^2 + 2681^2 .

It is a cyclic number.

It is not a de Polignac number, because 31002161 - 2² = 31002157 is a prime.

It is a super-2 number, since 2×31002161² = 1922267973339842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31002121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15501080 + 15501081.

It is an arithmetic number, because the mean of its divisors is an integer number (15501081).

Almost surely, 2^31002161 is an apocalyptic number.

It is an amenable number.

31002161 is a deficient number, since it is larger than the sum of its proper divisors (1).

31002161 is an equidigital number, since it uses as much as digits as its factorization.

31002161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 31002161 is about 5567.9584229770. The cubic root of 31002161 is about 314.1453645573.

Adding to 31002161 its reverse (16120013), we get a palindrome (47122174).

The spelling of 31002161 in words is "thirty-one million, two thousand, one hundred sixty-one".