31636660409 has 2 divisors, whose sum is σ = 31636660410. Its totient is φ = 31636660408.

The previous prime is 31636660373. The next prime is 31636660421. The reversal of 31636660409 is 90406663613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17223937600 + 14412722809 = 131240^2 + 120053^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31636660409 is a prime.

It is a super-3 number, since 3×31636660409³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31636660409.

It is not a weakly prime, because it can be changed into another prime (31636660469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15818330204 + 15818330205.

It is an arithmetic number, because the mean of its divisors is an integer number (15818330205).

Almost surely, 2^31636660409 is an apocalyptic number.

It is an amenable number.

31636660409 is a deficient number, since it is larger than the sum of its proper divisors (1).

31636660409 is an equidigital number, since it uses as much as digits as its factorization.

31636660409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 44.

The spelling of 31636660409 in words is "thirty-one billion, six hundred thirty-six million, six hundred sixty thousand, four hundred nine".