691462939 has 2 divisors, whose sum is σ = 691462940. Its totient is φ = 691462938.

The previous prime is 691462927. The next prime is 691462951. The reversal of 691462939 is 939264196.

It is a balanced prime because it is at equal distance from previous prime (691462927) and next prime (691462951).

It is a cyclic number.

It is not a de Polignac number, because 691462939 - 2²⁷ = 557245211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691462892 and 691462901.

It is not a weakly prime, because it can be changed into another prime (691462969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345731469 + 345731470.

It is an arithmetic number, because the mean of its divisors is an integer number (345731470).

Almost surely, 2^691462939 is an apocalyptic number.

691462939 is a deficient number, since it is larger than the sum of its proper divisors (1).

691462939 is an equidigital number, since it uses as much as digits as its factorization.

691462939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 49.

The square root of 691462939 is about 26295.6828966277. The cubic root of 691462939 is about 884.2796606868.

The spelling of 691462939 in words is "six hundred ninety-one million, four hundred sixty-two thousand, nine hundred thirty-nine".