52781891 has 2 divisors, whose sum is σ = 52781892. Its totient is φ = 52781890.

The previous prime is 52781887. The next prime is 52781903. The reversal of 52781891 is 19818725.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 52781891 - 2² = 52781887 is a prime.

It is not a weakly prime, because it can be changed into another prime (52781831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26390945 + 26390946.

It is an arithmetic number, because the mean of its divisors is an integer number (26390946).

Almost surely, 2^52781891 is an apocalyptic number.

52781891 is a deficient number, since it is larger than the sum of its proper divisors (1).

52781891 is an equidigital number, since it uses as much as digits as its factorization.

52781891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 41.

The square root of 52781891 is about 7265.1146584207. The cubic root of 52781891 is about 375.1125967071.

The spelling of 52781891 in words is "fifty-two million, seven hundred eighty-one thousand, eight hundred ninety-one".