691009050 has 48 divisors (see below), whose sum is σ = 1735424640. Its totient is φ = 181933440.

The previous prime is 691009049. The next prime is 691009061. The reversal of 691009050 is 50900196.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 691008999 and 691009017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17307 + ... + 41006.

It is an arithmetic number, because the mean of its divisors is an integer number (36154680).

Almost surely, 2^691009050 is an apocalyptic number.

691009050 is an abundant number, since it is smaller than the sum of its proper divisors (1044415590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691009050 is a wasteful number, since it uses less digits than its factorization.

691009050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58407 (or 58402 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 691009050 is about 26287.0509947388. The cubic root of 691009050 is about 884.0861325204.

The spelling of 691009050 in words is "six hundred ninety-one million, nine thousand, fifty".