51111787 has 2 divisors, whose sum is σ = 51111788. Its totient is φ = 51111786.

The previous prime is 51111761. The next prime is 51111857. The reversal of 51111787 is 78711115.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51111787 is a prime.

It is a super-2 number, since 2×51111787² = 5224829540666738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51111737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25555893 + 25555894.

It is an arithmetic number, because the mean of its divisors is an integer number (25555894).

Almost surely, 2^51111787 is an apocalyptic number.

51111787 is a deficient number, since it is larger than the sum of its proper divisors (1).

51111787 is an equidigital number, since it uses as much as digits as its factorization.

51111787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1960, while the sum is 31.

The square root of 51111787 is about 7149.2507999090. The cubic root of 51111787 is about 371.1137296845.

The spelling of 51111787 in words is "fifty-one million, one hundred eleven thousand, seven hundred eighty-seven".