51651919 has 8 divisors (see below), whose sum is σ = 57547008. Its totient is φ = 45956760.

The previous prime is 51651907. The next prime is 51651949. The reversal of 51651919 is 91915615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51651919 - 2⁷ = 51651791 is a prime.

It is a super-2 number, since 2×51651919² = 5335841472765122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51651949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49437 + ... + 50470.

It is an arithmetic number, because the mean of its divisors is an integer number (7193376).

Almost surely, 2^51651919 is an apocalyptic number.

51651919 is a deficient number, since it is larger than the sum of its proper divisors (5895089).

51651919 is a wasteful number, since it uses less digits than its factorization.

51651919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99965.

The product of its digits is 12150, while the sum is 37.

The square root of 51651919 is about 7186.9269510689. The cubic root of 51651919 is about 372.4164195464.

The spelling of 51651919 in words is "fifty-one million, six hundred fifty-one thousand, nine hundred nineteen".