691142172 has 24 divisors (see below), whose sum is σ = 1843046016. Its totient is φ = 197469168.

The previous prime is 691142167. The next prime is 691142189. The reversal of 691142172 is 271241196.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4113858 + ... + 4114025.

It is an arithmetic number, because the mean of its divisors is an integer number (76793584).

Almost surely, 2^691142172 is an apocalyptic number.

It is an amenable number.

691142172 is an abundant number, since it is smaller than the sum of its proper divisors (1151903844).

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

691142172 is a wasteful number, since it uses less digits than its factorization.

691142172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8227897 (or 8227895 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 691142172 is about 26289.5829559923. The cubic root of 691142172 is about 884.1429015585.

The spelling of 691142172 in words is "six hundred ninety-one million, one hundred forty-two thousand, one hundred seventy-two".