31450561961 has 16 divisors (see below), whose sum is σ = 38768655744. Its totient is φ = 24845215104.

The previous prime is 31450561949. The next prime is 31450562023. The reversal of 31450561961 is 16916505413.

It is a cyclic number.

It is not a de Polignac number, because 31450561961 - 2³⁰ = 30376820137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31450561921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210236 + ... + 327261.

It is an arithmetic number, because the mean of its divisors is an integer number (2423040984).

Almost surely, 2^31450561961 is an apocalyptic number.

It is an amenable number.

31450561961 is a deficient number, since it is larger than the sum of its proper divisors (7318093783).

31450561961 is a wasteful number, since it uses less digits than its factorization.

31450561961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538160.

The product of its (nonzero) digits is 97200, while the sum is 41.

The spelling of 31450561961 in words is "thirty-one billion, four hundred fifty million, five hundred sixty-one thousand, nine hundred sixty-one".