312007172981 has 8 divisors (see below), whose sum is σ = 364872176064. Its totient is φ = 261215307360.

The previous prime is 312007172963. The next prime is 312007172987. The reversal of 312007172981 is 189271700213.

It is a happy number.

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

It is not a de Polignac number, because 312007172981 - 2³⁰ = 310933431157 is a prime.

It is a super-2 number, since 2×312007172981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312007172987) 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, 518284040 + ... + 518284641.

It is an arithmetic number, because the mean of its divisors is an integer number (45609022008).

Almost surely, 2^312007172981 is an apocalyptic number.

It is an amenable number.

312007172981 is a deficient number, since it is larger than the sum of its proper divisors (52865003083).

312007172981 is a wasteful number, since it uses less digits than its factorization.

312007172981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036568731.

The product of its (nonzero) digits is 42336, while the sum is 41.

The spelling of 312007172981 in words is "three hundred twelve billion, seven million, one hundred seventy-two thousand, nine hundred eighty-one".