31400763661 has 4 divisors (see below), whose sum is σ = 31724482972. Its totient is φ = 31077044352.

The previous prime is 31400763613. The next prime is 31400763673. The reversal of 31400763661 is 16636700413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16636700413 = 1553 ⋅10712621.

It can be written as a sum of positive squares in 2 ways, for example, as 9535522500 + 21865241161 = 97650^2 + 147869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31400763661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31400763661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400763161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161859510 + ... + 161859703.

It is an arithmetic number, because the mean of its divisors is an integer number (7931120743).

Almost surely, 2^31400763661 is an apocalyptic number.

It is an amenable number.

31400763661 is a deficient number, since it is larger than the sum of its proper divisors (323719311).

31400763661 is an equidigital number, since it uses as much as digits as its factorization.

31400763661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323719310.

The product of its (nonzero) digits is 54432, while the sum is 37.

The spelling of 31400763661 in words is "thirty-one billion, four hundred million, seven hundred sixty-three thousand, six hundred sixty-one".