51023491 has 2 divisors, whose sum is σ = 51023492. Its totient is φ = 51023490.

The previous prime is 51023449. The next prime is 51023501. The reversal of 51023491 is 19432015.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51023491 - 2⁷ = 51023363 is a prime.

It is not a weakly prime, because it can be changed into another prime (51023191) 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, 25511745 + 25511746.

It is an arithmetic number, because the mean of its divisors is an integer number (25511746).

Almost surely, 2^51023491 is an apocalyptic number.

51023491 is a deficient number, since it is larger than the sum of its proper divisors (1).

51023491 is an equidigital number, since it uses as much as digits as its factorization.

51023491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 51023491 is about 7143.0729381688. The cubic root of 51023491 is about 370.8999059148.

The spelling of 51023491 in words is "fifty-one million, twenty-three thousand, four hundred ninety-one".