51440745 has 16 divisors (see below), whose sum is σ = 82700352. Its totient is φ = 27303360.

The previous prime is 51440737. The next prime is 51440777. The reversal of 51440745 is 54704415.

It is not a de Polignac number, because 51440745 - 2³ = 51440737 is a prime.

It is a Curzon 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, 4962 + ... + 11291.

It is an arithmetic number, because the mean of its divisors is an integer number (5168772).

Almost surely, 2^51440745 is an apocalyptic number.

It is an amenable number.

51440745 is a deficient number, since it is larger than the sum of its proper divisors (31259607).

51440745 is a wasteful number, since it uses less digits than its factorization.

51440745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16472.

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 51440745 is about 7172.2203675013. The cubic root of 51440745 is about 371.9081965046.

The spelling of 51440745 in words is "fifty-one million, four hundred forty thousand, seven hundred forty-five".