31671257 has 2 divisors, whose sum is σ = 31671258. Its totient is φ = 31671256.

The previous prime is 31671247. The next prime is 31671281. The reversal of 31671257 is 75217613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29203216 + 2468041 = 5404^2 + 1571^2 .

It is a cyclic number.

It is not a de Polignac number, because 31671257 - 2¹² = 31667161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31671217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15835628 + 15835629.

It is an arithmetic number, because the mean of its divisors is an integer number (15835629).

Almost surely, 2^31671257 is an apocalyptic number.

It is an amenable number.

31671257 is a deficient number, since it is larger than the sum of its proper divisors (1).

31671257 is an equidigital number, since it uses as much as digits as its factorization.

31671257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 32.

The square root of 31671257 is about 5627.7221857515. The cubic root of 31671257 is about 316.3892848320.

The spelling of 31671257 in words is "thirty-one million, six hundred seventy-one thousand, two hundred fifty-seven".