691140929 has 4 divisors (see below), whose sum is σ = 692549040. Its totient is φ = 689732820.

The previous prime is 691140911. The next prime is 691140937. The reversal of 691140929 is 929041196.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 691140929 - 2¹⁶ = 691075393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691140959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703319 + ... + 704300.

It is an arithmetic number, because the mean of its divisors is an integer number (173137260).

Almost surely, 2^691140929 is an apocalyptic number.

It is an amenable number.

691140929 is a deficient number, since it is larger than the sum of its proper divisors (1408111).

691140929 is a wasteful number, since it uses less digits than its factorization.

691140929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408110.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 691140929 is about 26289.5593154393. The cubic root of 691140929 is about 884.1423715227.

The spelling of 691140929 in words is "six hundred ninety-one million, one hundred forty thousand, nine hundred twenty-nine".