691793051 has 2 divisors, whose sum is σ = 691793052. Its totient is φ = 691793050.

The previous prime is 691792963. The next prime is 691793083. The reversal of 691793051 is 150397196.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691793051 - 2¹⁰ = 691792027 is a prime.

It is not a weakly prime, because it can be changed into another prime (691793951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345896525 + 345896526.

It is an arithmetic number, because the mean of its divisors is an integer number (345896526).

Almost surely, 2^691793051 is an apocalyptic number.

691793051 is a deficient number, since it is larger than the sum of its proper divisors (1).

691793051 is an equidigital number, since it uses as much as digits as its factorization.

691793051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 691793051 is about 26301.9590715216. The cubic root of 691793051 is about 884.4203599055.

The spelling of 691793051 in words is "six hundred ninety-one million, seven hundred ninety-three thousand, fifty-one".