51474645 has 24 divisors (see below), whose sum is σ = 90484992. Its totient is φ = 27064800.

The previous prime is 51474641. The next prime is 51474649. The reversal of 51474645 is 54647415.

51474645 is a `hidden beast` number, since 5 + 1 + 4 + 7 + 4 + 645 = 666.

It is an interprime number because it is at equal distance from previous prime (51474641) and next prime (51474649).

It is not a de Polignac number, because 51474645 - 2² = 51474641 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51474641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4861 + ... + 11250.

It is an arithmetic number, because the mean of its divisors is an integer number (3770208).

Almost surely, 2^51474645 is an apocalyptic number.

It is an amenable number.

51474645 is a deficient number, since it is larger than the sum of its proper divisors (39010347).

51474645 is a wasteful number, since it uses less digits than its factorization.

51474645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16193 (or 16190 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 51474645 is about 7174.5832631589. The cubic root of 51474645 is about 371.9898757217.

The spelling of 51474645 in words is "fifty-one million, four hundred seventy-four thousand, six hundred forty-five".