51617643 has 32 divisors (see below), whose sum is σ = 87009792. Its totient is φ = 26438400.

The previous prime is 51617633. The next prime is 51617653. The reversal of 51617643 is 34671615.

It is an interprime number because it is at equal distance from previous prime (51617633) and next prime (51617653).

It is not a de Polignac number, because 51617643 - 2⁵ = 51617611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (51617633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15333 + ... + 18393.

It is an arithmetic number, because the mean of its divisors is an integer number (2719056).

Almost surely, 2^51617643 is an apocalyptic number.

51617643 is a deficient number, since it is larger than the sum of its proper divisors (35392149).

51617643 is a wasteful number, since it uses less digits than its factorization.

51617643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3155.

The product of its digits is 15120, while the sum is 33.

The square root of 51617643 is about 7184.5419478210. The cubic root of 51617643 is about 372.3340233188.

The spelling of 51617643 in words is "fifty-one million, six hundred seventeen thousand, six hundred forty-three".