31444238921 has 8 divisors (see below), whose sum is σ = 33316286760. Its totient is φ = 29574678528.

The previous prime is 31444238843. The next prime is 31444238951. The reversal of 31444238921 is 12983244413.

It can be written as a sum of positive squares in 4 ways, for example, as 4842628921 + 26601610000 = 69589^2 + 163100^2 .

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 31444238921 - 2³⁰ = 30370497097 is a prime.

It is a super-2 number, since 2×31444238921² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31444238951) 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, 595796 + ... + 646421.

It is an arithmetic number, because the mean of its divisors is an integer number (4164535845).

Almost surely, 2^31444238921 is an apocalyptic number.

It is an amenable number.

31444238921 is a deficient number, since it is larger than the sum of its proper divisors (1872047839).

31444238921 is a wasteful number, since it uses less digits than its factorization.

31444238921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243723.

The product of its digits is 165888, while the sum is 41.

The spelling of 31444238921 in words is "thirty-one billion, four hundred forty-four million, two hundred thirty-eight thousand, nine hundred twenty-one".