51612147 has 20 divisors (see below), whose sum is σ = 77679096. Its totient is φ = 34149600.

The previous prime is 51612133. The next prime is 51612149. The reversal of 51612147 is 74121615.

It is a happy number.

51612147 is a `hidden beast` number, since 5 + 1 + 612 + 1 + 47 = 666.

It is not a de Polignac number, because 51612147 - 2⁸ = 51611891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 51612147.

It is not an unprimeable number, because it can be changed into a prime (51612149) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8772 + ... + 13422.

Almost surely, 2^51612147 is an apocalyptic number.

51612147 is a deficient number, since it is larger than the sum of its proper divisors (26066949).

51612147 is a wasteful number, since it uses less digits than its factorization.

51612147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4800 (or 4791 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 51612147 is about 7184.1594497895. The cubic root of 51612147 is about 372.3208080672.

The spelling of 51612147 in words is "fifty-one million, six hundred twelve thousand, one hundred forty-seven".