51295981 has 8 divisors (see below), whose sum is σ = 56514528. Its totient is φ = 46170000.

The previous prime is 51295967. The next prime is 51296017. The reversal of 51295981 is 18959215.

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 51295981 - 2²³ = 42907373 is a prime.

It is a super-2 number, since 2×51295981² = 5262555333504722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51295921) 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, 21975 + ... + 24196.

It is an arithmetic number, because the mean of its divisors is an integer number (7064316).

Almost surely, 2^51295981 is an apocalyptic number.

It is an amenable number.

51295981 is a deficient number, since it is larger than the sum of its proper divisors (5218547).

51295981 is a wasteful number, since it uses less digits than its factorization.

51295981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46283.

The product of its digits is 32400, while the sum is 40.

The square root of 51295981 is about 7162.1212639832. The cubic root of 51295981 is about 371.5589953569.

The spelling of 51295981 in words is "fifty-one million, two hundred ninety-five thousand, nine hundred eighty-one".