77761231 has 2 divisors, whose sum is σ = 77761232. Its totient is φ = 77761230.

The previous prime is 77761217. The next prime is 77761241. The reversal of 77761231 is 13216777.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77761231 - 2¹⁷ = 77630159 is a prime.

It is a super-2 number, since 2×77761231² = 12093618093270722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77761241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38880615 + 38880616.

It is an arithmetic number, because the mean of its divisors is an integer number (38880616).

Almost surely, 2^77761231 is an apocalyptic number.

77761231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77761231 is an equidigital number, since it uses as much as digits as its factorization.

77761231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12348, while the sum is 34.

The square root of 77761231 is about 8818.2328728606. The cubic root of 77761231 is about 426.8294488601.

The spelling of 77761231 in words is "seventy-seven million, seven hundred sixty-one thousand, two hundred thirty-one".