761720489 has 2 divisors, whose sum is σ = 761720490. Its totient is φ = 761720488.

The previous prime is 761720413. The next prime is 761720527. The reversal of 761720489 is 984027167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 742290025 + 19430464 = 27245^2 + 4408^2 .

It is a cyclic number.

It is not a de Polignac number, because 761720489 - 2²⁴ = 744943273 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (761770489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380860244 + 380860245.

It is an arithmetic number, because the mean of its divisors is an integer number (380860245).

Almost surely, 2^761720489 is an apocalyptic number.

It is an amenable number.

761720489 is a deficient number, since it is larger than the sum of its proper divisors (1).

761720489 is an equidigital number, since it uses as much as digits as its factorization.

761720489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 761720489 is about 27599.2842117327. The cubic root of 761720489 is about 913.2686417527.

The spelling of 761720489 in words is "seven hundred sixty-one million, seven hundred twenty thousand, four hundred eighty-nine".