691077049 has 16 divisors (see below), whose sum is σ = 765273600. Its totient is φ = 620072640.

The previous prime is 691077031. The next prime is 691077053. The reversal of 691077049 is 940770196.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 691077049 - 2⁷ = 691076921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691076996 and 691077014.

It is not an unprimeable number, because it can be changed into a prime (691077059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87244 + ... + 94834.

It is an arithmetic number, because the mean of its divisors is an integer number (47829600).

Almost surely, 2^691077049 is an apocalyptic number.

It is an amenable number.

691077049 is a deficient number, since it is larger than the sum of its proper divisors (74196551).

691077049 is a wasteful number, since it uses less digits than its factorization.

691077049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7800.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 691077049 is about 26288.3443563873. The cubic root of 691077049 is about 884.1151311764.

The spelling of 691077049 in words is "six hundred ninety-one million, seventy-seven thousand, forty-nine".