77238961 has 2 divisors, whose sum is σ = 77238962. Its totient is φ = 77238960.

The previous prime is 77238923. The next prime is 77238989. The reversal of 77238961 is 16983277.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72573361 + 4665600 = 8519^2 + 2160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77238961 is a prime.

It is not a weakly prime, because it can be changed into another prime (77238901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38619480 + 38619481.

It is an arithmetic number, because the mean of its divisors is an integer number (38619481).

Almost surely, 2^77238961 is an apocalyptic number.

It is an amenable number.

77238961 is a deficient number, since it is larger than the sum of its proper divisors (1).

77238961 is an equidigital number, since it uses as much as digits as its factorization.

77238961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 43.

The square root of 77238961 is about 8788.5699064182. The cubic root of 77238961 is about 425.8717258730.

The spelling of 77238961 in words is "seventy-seven million, two hundred thirty-eight thousand, nine hundred sixty-one".