42777913 has 2 divisors, whose sum is σ = 42777914. Its totient is φ = 42777912.

The previous prime is 42777901. The next prime is 42777961. The reversal of 42777913 is 31977724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42667024 + 110889 = 6532^2 + 333^2 .

It is a cyclic number.

It is not a de Polignac number, because 42777913 - 2⁵ = 42777881 is a prime.

It is not a weakly prime, because it can be changed into another prime (42777983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21388956 + 21388957.

It is an arithmetic number, because the mean of its divisors is an integer number (21388957).

Almost surely, 2^42777913 is an apocalyptic number.

It is an amenable number.

42777913 is a deficient number, since it is larger than the sum of its proper divisors (1).

42777913 is an equidigital number, since it uses as much as digits as its factorization.

42777913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 40.

The square root of 42777913 is about 6540.4826274519. The cubic root of 42777913 is about 349.7356180293.

The spelling of 42777913 in words is "forty-two million, seven hundred seventy-seven thousand, nine hundred thirteen".