31011649 has 2 divisors, whose sum is σ = 31011650. Its totient is φ = 31011648.

The previous prime is 31011619. The next prime is 31011653. The reversal of 31011649 is 94611013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31002624 + 9025 = 5568^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 31011649 - 2¹³ = 31003457 is a prime.

It is not a weakly prime, because it can be changed into another prime (31011619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15505824 + 15505825.

It is an arithmetic number, because the mean of its divisors is an integer number (15505825).

Almost surely, 2^31011649 is an apocalyptic number.

It is an amenable number.

31011649 is a deficient number, since it is larger than the sum of its proper divisors (1).

31011649 is an equidigital number, since it uses as much as digits as its factorization.

31011649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 31011649 is about 5568.8103756548. The cubic root of 31011649 is about 314.1774086375.

The spelling of 31011649 in words is "thirty-one million, eleven thousand, six hundred forty-nine".