191231025 has 24 divisors (see below), whose sum is σ = 317937984. Its totient is φ = 101419200.

The previous prime is 191231023. The next prime is 191231041. The reversal of 191231025 is 520132191.

It is not a de Polignac number, because 191231025 - 2¹ = 191231023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191230986 and 191231004.

It is not an unprimeable number, because it can be changed into a prime (191231021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6532 + ... + 20618.

It is an arithmetic number, because the mean of its divisors is an integer number (13247416).

Almost surely, 2^191231025 is an apocalyptic number.

191231025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191231025 is a deficient number, since it is larger than the sum of its proper divisors (126706959).

191231025 is a wasteful number, since it uses less digits than its factorization.

191231025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14281 (or 14276 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 191231025 is about 13828.6306263491. The cubic root of 191231025 is about 576.1286213296.

The spelling of 191231025 in words is "one hundred ninety-one million, two hundred thirty-one thousand, twenty-five".