773521961 has 2 divisors, whose sum is σ = 773521962. Its totient is φ = 773521960.

The previous prime is 773521871. The next prime is 773521967. The reversal of 773521961 is 169125377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581533225 + 191988736 = 24115^2 + 13856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-773521961 is a prime.

It is equal to p_39853157 and since 773521961 and 39853157 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (773521967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386760980 + 386760981.

It is an arithmetic number, because the mean of its divisors is an integer number (386760981).

Almost surely, 2^773521961 is an apocalyptic number.

It is an amenable number.

773521961 is a deficient number, since it is larger than the sum of its proper divisors (1).

773521961 is an equidigital number, since it uses as much as digits as its factorization.

773521961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 41.

The square root of 773521961 is about 27812.2627810108. The cubic root of 773521961 is about 917.9609697460.

The spelling of 773521961 in words is "seven hundred seventy-three million, five hundred twenty-one thousand, nine hundred sixty-one".