51192091 has 4 divisors (see below), whose sum is σ = 51245784. Its totient is φ = 51138400.

The previous prime is 51192019. The next prime is 51192101. The reversal of 51192091 is 19029115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51192091 - 2⁷ = 51191963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51192991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25390 + ... + 27331.

It is an arithmetic number, because the mean of its divisors is an integer number (12811446).

Almost surely, 2^51192091 is an apocalyptic number.

51192091 is a deficient number, since it is larger than the sum of its proper divisors (53693).

51192091 is an equidigital number, since it uses as much as digits as its factorization.

51192091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53692.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 51192091 is about 7154.8648484790. The cubic root of 51192091 is about 371.3079857429.

The spelling of 51192091 in words is "fifty-one million, one hundred ninety-two thousand, ninety-one".