31860786649 has 2 divisors, whose sum is σ = 31860786650. Its totient is φ = 31860786648.

The previous prime is 31860786611. The next prime is 31860786653. The reversal of 31860786649 is 94668706813.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31517611024 + 343175625 = 177532^2 + 18525^2 .

It is a cyclic number.

It is not a de Polignac number, because 31860786649 - 2²⁹ = 31323915737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31860786593 and 31860786602.

It is not a weakly prime, because it can be changed into another prime (31860784649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15930393324 + 15930393325.

It is an arithmetic number, because the mean of its divisors is an integer number (15930393325).

Almost surely, 2^31860786649 is an apocalyptic number.

It is an amenable number.

31860786649 is a deficient number, since it is larger than the sum of its proper divisors (1).

31860786649 is an equidigital number, since it uses as much as digits as its factorization.

31860786649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10450944, while the sum is 58.

The spelling of 31860786649 in words is "thirty-one billion, eight hundred sixty million, seven hundred eighty-six thousand, six hundred forty-nine".