51188491 has 2 divisors, whose sum is σ = 51188492. Its totient is φ = 51188490.

The previous prime is 51188483. The next prime is 51188497. The reversal of 51188491 is 19488115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51188491 - 2³ = 51188483 is a prime.

It is a super-2 number, since 2×51188491² = 5240523221714162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51188491.

It is not a weakly prime, because it can be changed into another prime (51188497) 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, 25594245 + 25594246.

It is an arithmetic number, because the mean of its divisors is an integer number (25594246).

Almost surely, 2^51188491 is an apocalyptic number.

51188491 is a deficient number, since it is larger than the sum of its proper divisors (1).

51188491 is an equidigital number, since it uses as much as digits as its factorization.

51188491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 37.

The square root of 51188491 is about 7154.6132669768. The cubic root of 51188491 is about 371.2992816635.

The spelling of 51188491 in words is "fifty-one million, one hundred eighty-eight thousand, four hundred ninety-one".