51981153 has 16 divisors (see below), whose sum is σ = 81142656. Its totient is φ = 28978560.

The previous prime is 51981151. The next prime is 51981191. The reversal of 51981153 is 35118915.

It is not a de Polignac number, because 51981153 - 2¹ = 51981151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51981151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29326 + ... + 31047.

It is an arithmetic number, because the mean of its divisors is an integer number (5071416).

Almost surely, 2^51981153 is an apocalyptic number.

It is an amenable number.

51981153 is a deficient number, since it is larger than the sum of its proper divisors (29161503).

51981153 is a wasteful number, since it uses less digits than its factorization.

51981153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60424.

The product of its digits is 5400, while the sum is 33.

The square root of 51981153 is about 7209.7956281714. The cubic root of 51981153 is about 373.2060162341.

The spelling of 51981153 in words is "fifty-one million, nine hundred eighty-one thousand, one hundred fifty-three".