51560491 has 2 divisors, whose sum is σ = 51560492. Its totient is φ = 51560490.

The previous prime is 51560489. The next prime is 51560497. The reversal of 51560491 is 19406515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51560491 - 2¹ = 51560489 is a prime.

It is a super-2 number, since 2×51560491² = 5316968464322162, which contains 22 as substring.

Together with 51560489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51560497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25780245 + 25780246.

It is an arithmetic number, because the mean of its divisors is an integer number (25780246).

Almost surely, 2^51560491 is an apocalyptic number.

51560491 is a deficient number, since it is larger than the sum of its proper divisors (1).

51560491 is an equidigital number, since it uses as much as digits as its factorization.

51560491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 51560491 is about 7180.5634180056. The cubic root of 51560491 is about 372.1965542195.

The spelling of 51560491 in words is "fifty-one million, five hundred sixty thousand, four hundred ninety-one".