31070640649 has 2 divisors, whose sum is σ = 31070640650. Its totient is φ = 31070640648.

The previous prime is 31070640583. The next prime is 31070640673. The reversal of 31070640649 is 94604607013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27264614400 + 3806026249 = 165120^2 + 61693^2 .

It is a cyclic number.

It is not a de Polignac number, because 31070640649 - 2⁹ = 31070640137 is a prime.

It is a super-2 number, since 2×31070640649² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31070620649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15535320324 + 15535320325.

It is an arithmetic number, because the mean of its divisors is an integer number (15535320325).

Almost surely, 2^31070640649 is an apocalyptic number.

It is an amenable number.

31070640649 is a deficient number, since it is larger than the sum of its proper divisors (1).

31070640649 is an equidigital number, since it uses as much as digits as its factorization.

31070640649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 31070640649 in words is "thirty-one billion, seventy million, six hundred forty thousand, six hundred forty-nine".