51202091 has 2 divisors, whose sum is σ = 51202092. Its totient is φ = 51202090.

The previous prime is 51202087. The next prime is 51202097. The reversal of 51202091 is 19020215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51202091 - 2² = 51202087 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51202097) 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 as a sum of consecutive naturals, namely, 25601045 + 25601046.

It is an arithmetic number, because the mean of its divisors is an integer number (25601046).

Almost surely, 2^51202091 is an apocalyptic number.

51202091 is a deficient number, since it is larger than the sum of its proper divisors (1).

51202091 is an equidigital number, since it uses as much as digits as its factorization.

51202091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 51202091 is about 7155.5636395745. The cubic root of 51202091 is about 371.3321616005.

The spelling of 51202091 in words is "fifty-one million, two hundred two thousand, ninety-one".