31662131 has 2 divisors, whose sum is σ = 31662132. Its totient is φ = 31662130.

The previous prime is 31662101. The next prime is 31662139. The reversal of 31662131 is 13126613.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31662131 - 2¹⁰ = 31661107 is a prime.

It is a super-2 number, since 2×31662131² = 2004981078922322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31662097 and 31662106.

It is not a weakly prime, because it can be changed into another prime (31662139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15831065 + 15831066.

It is an arithmetic number, because the mean of its divisors is an integer number (15831066).

Almost surely, 2^31662131 is an apocalyptic number.

31662131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31662131 is an equidigital number, since it uses as much as digits as its factorization.

31662131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 31662131 is about 5626.9113197206. The cubic root of 31662131 is about 316.3588929640.

Adding to 31662131 its reverse (13126613), we get a palindrome (44788744).

The spelling of 31662131 in words is "thirty-one million, six hundred sixty-two thousand, one hundred thirty-one".