77691499 has 2 divisors, whose sum is σ = 77691500. Its totient is φ = 77691498.

The previous prime is 77691473. The next prime is 77691503. The reversal of 77691499 is 99419677.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77691499 is a prime.

It is not a weakly prime, because it can be changed into another prime (77691599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38845749 + 38845750.

It is an arithmetic number, because the mean of its divisors is an integer number (38845750).

Almost surely, 2^77691499 is an apocalyptic number.

77691499 is a deficient number, since it is larger than the sum of its proper divisors (1).

77691499 is an equidigital number, since it uses as much as digits as its factorization.

77691499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 52.

The square root of 77691499 is about 8814.2781326663. The cubic root of 77691499 is about 426.7018249701.

The spelling of 77691499 in words is "seventy-seven million, six hundred ninety-one thousand, four hundred ninety-nine".