691249041 has 24 divisors (see below), whose sum is σ = 1145199744. Its totient is φ = 393583680.

The previous prime is 691249001. The next prime is 691249073. The reversal of 691249041 is 140942196.

It is a happy number.

It is not a de Polignac number, because 691249041 - 2⁷ = 691248913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691248987 and 691249005.

It is not an unprimeable number, because it can be changed into a prime (691249001) 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, 1821 + ... + 37226.

It is an arithmetic number, because the mean of its divisors is an integer number (47716656).

Almost surely, 2^691249041 is an apocalyptic number.

It is an amenable number.

691249041 is a deficient number, since it is larger than the sum of its proper divisors (453950703).

691249041 is a wasteful number, since it uses less digits than its factorization.

691249041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39341 (or 39338 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 691249041 is about 26291.6154125227. The cubic root of 691249041 is about 884.1884698955.

The spelling of 691249041 in words is "six hundred ninety-one million, two hundred forty-nine thousand, forty-one".