31626617641 has 8 divisors (see below), whose sum is σ = 33493326984. Its totient is φ = 29760610560.

The previous prime is 31626617639. The next prime is 31626617657. The reversal of 31626617641 is 14671662613.

It can be written as a sum of positive squares in 4 ways, for example, as 587577600 + 31039040041 = 24240^2 + 176179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31626617641 - 2¹ = 31626617639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31626617611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81390 + ... + 264343.

It is an arithmetic number, because the mean of its divisors is an integer number (4186665873).

Almost surely, 2^31626617641 is an apocalyptic number.

It is an amenable number.

31626617641 is a deficient number, since it is larger than the sum of its proper divisors (1866709343).

31626617641 is a wasteful number, since it uses less digits than its factorization.

31626617641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351131.

The product of its digits is 217728, while the sum is 43.

The spelling of 31626617641 in words is "thirty-one billion, six hundred twenty-six million, six hundred seventeen thousand, six hundred forty-one".