51142945 has 16 divisors (see below), whose sum is σ = 70610688. Its totient is φ = 34833600.

The previous prime is 51142939. The next prime is 51142951. The reversal of 51142945 is 54924115.

It is an interprime number because it is at equal distance from previous prime (51142939) and next prime (51142951).

It is not a de Polignac number, because 51142945 - 2³ = 51142937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447 + ... + 10123.

It is an arithmetic number, because the mean of its divisors is an integer number (4413168).

Almost surely, 2^51142945 is an apocalyptic number.

It is an amenable number.

51142945 is a deficient number, since it is larger than the sum of its proper divisors (19467743).

51142945 is a wasteful number, since it uses less digits than its factorization.

51142945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9840.

The product of its digits is 7200, while the sum is 31.

The square root of 51142945 is about 7151.4295773642. The cubic root of 51142945 is about 371.1891252922.

The spelling of 51142945 in words is "fifty-one million, one hundred forty-two thousand, nine hundred forty-five".