50778551 has 2 divisors, whose sum is σ = 50778552. Its totient is φ = 50778550.

The previous prime is 50778547. The next prime is 50778649. The reversal of 50778551 is 15587705.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 50778551 - 2² = 50778547 is a prime.

It is a super-2 number, since 2×50778551² = 5156922483319202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50778151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25389275 + 25389276.

It is an arithmetic number, because the mean of its divisors is an integer number (25389276).

Almost surely, 2^50778551 is an apocalyptic number.

50778551 is a deficient number, since it is larger than the sum of its proper divisors (1).

50778551 is an equidigital number, since it uses as much as digits as its factorization.

50778551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49000, while the sum is 38.

The square root of 50778551 is about 7125.9070299857. The cubic root of 50778551 is about 370.3054477972.

The spelling of 50778551 in words is "fifty million, seven hundred seventy-eight thousand, five hundred fifty-one".