51132981 has 8 divisors (see below), whose sum is σ = 70376704. Its totient is φ = 32988960.

The previous prime is 51132973. The next prime is 51132989. The reversal of 51132981 is 18923115.

It is an interprime number because it is at equal distance from previous prime (51132973) and next prime (51132989).

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

It is not a de Polignac number, because 51132981 - 2³ = 51132973 is a prime.

It is a super-2 number, since 2×51132981² = 5229163491892722, which 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 (51132989) 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, 274816 + ... + 275001.

It is an arithmetic number, because the mean of its divisors is an integer number (8797088).

Almost surely, 2^51132981 is an apocalyptic number.

It is an amenable number.

51132981 is a deficient number, since it is larger than the sum of its proper divisors (19243723).

51132981 is a wasteful number, since it uses less digits than its factorization.

51132981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549851.

The product of its digits is 2160, while the sum is 30.

The square root of 51132981 is about 7150.7328995006. The cubic root of 51132981 is about 371.1650179029.

The spelling of 51132981 in words is "fifty-one million, one hundred thirty-two thousand, nine hundred eighty-one".