231691947 has 16 divisors (see below), whose sum is σ = 325643520. Its totient is φ = 146124000.

The previous prime is 231691939. The next prime is 231691961. The reversal of 231691947 is 749196132.

It is not a de Polignac number, because 231691947 - 2³ = 231691939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231691899 and 231691908.

It is not an unprimeable number, because it can be changed into a prime (231691907) 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, 44322 + ... + 49272.

It is an arithmetic number, because the mean of its divisors is an integer number (20352720).

Almost surely, 2^231691947 is an apocalyptic number.

231691947 is a deficient number, since it is larger than the sum of its proper divisors (93951573).

231691947 is a wasteful number, since it uses less digits than its factorization.

231691947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5794.

The product of its digits is 81648, while the sum is 42.

The square root of 231691947 is about 15221.4305175302. The cubic root of 231691947 is about 614.1912801884.

The spelling of 231691947 in words is "two hundred thirty-one million, six hundred ninety-one thousand, nine hundred forty-seven".