77350981 has 2 divisors, whose sum is σ = 77350982. Its totient is φ = 77350980.

The previous prime is 77350967. The next prime is 77350997. The reversal of 77350981 is 18905377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66161956 + 11189025 = 8134^2 + 3345^2 .

It is a cyclic number.

It is not a de Polignac number, because 77350981 - 2¹¹ = 77348933 is a prime.

It is a super-2 number, since 2×77350981² = 11966348523324722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77350961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38675490 + 38675491.

It is an arithmetic number, because the mean of its divisors is an integer number (38675491).

Almost surely, 2^77350981 is an apocalyptic number.

It is an amenable number.

77350981 is a deficient number, since it is larger than the sum of its proper divisors (1).

77350981 is an equidigital number, since it uses as much as digits as its factorization.

77350981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 77350981 is about 8794.9406478952. The cubic root of 77350981 is about 426.0775076264.

The spelling of 77350981 in words is "seventy-seven million, three hundred fifty thousand, nine hundred eighty-one".