31655641 has 2 divisors, whose sum is σ = 31655642. Its totient is φ = 31655640.

The previous prime is 31655627. The next prime is 31655677. The reversal of 31655641 is 14655613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19545241 + 12110400 = 4421^2 + 3480^2 .

It is a cyclic number.

It is not a de Polignac number, because 31655641 - 2¹⁷ = 31524569 is a prime.

It is equal to p_1953850 and since 31655641 and 1953850 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31655941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15827820 + 15827821.

It is an arithmetic number, because the mean of its divisors is an integer number (15827821).

Almost surely, 2^31655641 is an apocalyptic number.

It is an amenable number.

31655641 is a deficient number, since it is larger than the sum of its proper divisors (1).

31655641 is an equidigital number, since it uses as much as digits as its factorization.

31655641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 31655641 is about 5626.3345972311. The cubic root of 31655641 is about 316.3372760834.

The spelling of 31655641 in words is "thirty-one million, six hundred fifty-five thousand, six hundred forty-one".