51777919 has 2 divisors, whose sum is σ = 51777920. Its totient is φ = 51777918.

The previous prime is 51777893. The next prime is 51777949. The reversal of 51777919 is 91977715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51777919 - 2²¹ = 49680767 is a prime.

It is a super-2 number, since 2×51777919² = 5361905791941122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51777949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25888959 + 25888960.

It is an arithmetic number, because the mean of its divisors is an integer number (25888960).

Almost surely, 2^51777919 is an apocalyptic number.

51777919 is a deficient number, since it is larger than the sum of its proper divisors (1).

51777919 is an equidigital number, since it uses as much as digits as its factorization.

51777919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138915, while the sum is 46.

The square root of 51777919 is about 7195.6875279573. The cubic root of 51777919 is about 372.7189985887.

The spelling of 51777919 in words is "fifty-one million, seven hundred seventy-seven thousand, nine hundred nineteen".