51845651 has 18 divisors (see below), whose sum is σ = 61613172. Its totient is φ = 43246320.

The previous prime is 51845641. The next prime is 51845683. The reversal of 51845651 is 15654815.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-51845651 is a prime.

It is a super-2 number, since 2×51845651² = 5375943055227602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51845641) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 310370 + ... + 310536.

It is an arithmetic number, because the mean of its divisors is an integer number (3422954).

Almost surely, 2^51845651 is an apocalyptic number.

51845651 is a deficient number, since it is larger than the sum of its proper divisors (9767521).

51845651 is a wasteful number, since it uses less digits than its factorization.

51845651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 191 counting only the distinct ones).

The product of its digits is 24000, while the sum is 35.

The square root of 51845651 is about 7200.3924198616. The cubic root of 51845651 is about 372.8814488108.

The spelling of 51845651 in words is "fifty-one million, eight hundred forty-five thousand, six hundred fifty-one".