31722054381 has 10 divisors (see below), whose sum is σ = 47387266542. Its totient is φ = 21148036200.

The previous prime is 31722054341. The next prime is 31722054461. The reversal of 31722054381 is 18345022713.

31722054381 is a `hidden beast` number, since 3 + 1 + 7 + 220 + 54 + 381 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28903400100 + 2818654281 = 170010^2 + 53091^2 .

It is not a de Polignac number, because 31722054381 - 2⁶ = 31722054317 is a prime.

It is a super-2 number, since 2×31722054381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31722054341) 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 9 ways as a sum of consecutive naturals, for example, 195815070 + ... + 195815231.

Almost surely, 2^31722054381 is an apocalyptic number.

It is an amenable number.

31722054381 is a deficient number, since it is larger than the sum of its proper divisors (15665212161).

31722054381 is an equidigital number, since it uses as much as digits as its factorization.

31722054381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391630313 (or 391630304 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 31722054381 in words is "thirty-one billion, seven hundred twenty-two million, fifty-four thousand, three hundred eighty-one".