691042011 has 24 divisors (see below), whose sum is σ = 1018171392. Its totient is φ = 416578800.

The previous prime is 691041997. The next prime is 691042019. The reversal of 691042011 is 110240196.

It is not a de Polignac number, because 691042011 - 2⁵ = 691041979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691042019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64350 + ... + 74316.

It is an arithmetic number, because the mean of its divisors is an integer number (42423808).

Almost surely, 2^691042011 is an apocalyptic number.

691042011 is a deficient number, since it is larger than the sum of its proper divisors (327129381).

691042011 is a wasteful number, since it uses less digits than its factorization.

691042011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10183 (or 10172 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 691042011 is about 26287.6779309242. The cubic root of 691042011 is about 884.1001892103.

The spelling of 691042011 in words is "six hundred ninety-one million, forty-two thousand, eleven".