51169919 has 4 divisors (see below), whose sum is σ = 51262344. Its totient is φ = 51077496.

The previous prime is 51169879. The next prime is 51169961. The reversal of 51169919 is 91996115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91996115 = 5 ⋅18399223.

It is a cyclic number.

It is not a de Polignac number, because 51169919 - 2⁸ = 51169663 is a prime.

It is a super-2 number, since 2×51169919² = 5236721220933122, 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 (21169919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45377 + ... + 46490.

It is an arithmetic number, because the mean of its divisors is an integer number (12815586).

Almost surely, 2^51169919 is an apocalyptic number.

51169919 is a deficient number, since it is larger than the sum of its proper divisors (92425).

51169919 is an equidigital number, since it uses as much as digits as its factorization.

51169919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92424.

The product of its digits is 21870, while the sum is 41.

The square root of 51169919 is about 7153.3152453950. The cubic root of 51169919 is about 371.2543718002.

The spelling of 51169919 in words is "fifty-one million, one hundred sixty-nine thousand, nine hundred nineteen".