691113400 has 24 divisors (see below), whose sum is σ = 1606839120. Its totient is φ = 276445280.

The previous prime is 691113389. The next prime is 691113403. The reversal of 691113400 is 4311196.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691113403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1727584 + ... + 1727983.

It is an arithmetic number, because the mean of its divisors is an integer number (66951630).

Almost surely, 2^691113400 is an apocalyptic number.

It is an amenable number.

691113400 is an abundant number, since it is smaller than the sum of its proper divisors (915725720).

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

691113400 is a wasteful number, since it uses less digits than its factorization.

691113400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3455583 (or 3455574 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 691113400 is about 26289.0357373564. The cubic root of 691113400 is about 884.1306325380.

Adding to 691113400 its reverse (4311196), we get a palindrome (695424596).

The spelling of 691113400 in words is "six hundred ninety-one million, one hundred thirteen thousand, four hundred".