31950881 has 2 divisors, whose sum is σ = 31950882. Its totient is φ = 31950880.

The previous prime is 31950847. The next prime is 31950899. The reversal of 31950881 is 18805913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31460881 + 490000 = 5609^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 31950881 - 2¹⁸ = 31688737 is a prime.

It is a super-2 number, since 2×31950881² = 2041717593352322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31950811) 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, 15975440 + 15975441.

It is an arithmetic number, because the mean of its divisors is an integer number (15975441).

Almost surely, 2^31950881 is an apocalyptic number.

It is an amenable number.

31950881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31950881 is an equidigital number, since it uses as much as digits as its factorization.

31950881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 31950881 is about 5652.5110349295. The cubic root of 31950881 is about 317.3176864750.

The spelling of 31950881 in words is "thirty-one million, nine hundred fifty thousand, eight hundred eighty-one".