51791651 has 16 divisors (see below), whose sum is σ = 56216160. Its totient is φ = 47604480.

The previous prime is 51791647. The next prime is 51791711. The reversal of 51791651 is 15619715.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51791651 - 2² = 51791647 is a prime.

It is a super-2 number, since 2×51791651² = 5364750226611602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51791611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50621 + ... + 51633.

It is an arithmetic number, because the mean of its divisors is an integer number (3513510).

Almost surely, 2^51791651 is an apocalyptic number.

51791651 is a deficient number, since it is larger than the sum of its proper divisors (4424509).

51791651 is a wasteful number, since it uses less digits than its factorization.

51791651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126.

The product of its digits is 9450, while the sum is 35.

The square root of 51791651 is about 7196.6416473241. The cubic root of 51791651 is about 372.7519452256.

The spelling of 51791651 in words is "fifty-one million, seven hundred ninety-one thousand, six hundred fifty-one".