31423121200661 has 4 divisors (see below), whose sum is σ = 31423148868972. Its totient is φ = 31423093532352.

The previous prime is 31423121200637. The next prime is 31423121200699. The reversal of 31423121200661 is 16600212132413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28944464560036 + 2478656640625 = 5380006^2 + 1574375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31423121200661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423121200561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12054260 + ... + 14427453.

It is an arithmetic number, because the mean of its divisors is an integer number (7855787217243).

Almost surely, 2^{31423121200661} is an apocalyptic number.

It is an amenable number.

31423121200661 is a deficient number, since it is larger than the sum of its proper divisors (27668311).

31423121200661 is a wasteful number, since it uses less digits than its factorization.

31423121200661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27668310.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 31423121200661 in words is "thirty-one trillion, four hundred twenty-three billion, one hundred twenty-one million, two hundred thousand, six hundred sixty-one".