191920025 has 12 divisors (see below), whose sum is σ = 259615824. Its totient is φ = 139578000.

The previous prime is 191919997. The next prime is 191920061. The reversal of 191920025 is 520029191.

It is not a de Polignac number, because 191920025 - 2⁸ = 191919769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191920025.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 348671 + ... + 349220.

It is an arithmetic number, because the mean of its divisors is an integer number (21634652).

Almost surely, 2^191920025 is an apocalyptic number.

It is an amenable number.

191920025 is a deficient number, since it is larger than the sum of its proper divisors (67695799).

191920025 is a wasteful number, since it uses less digits than its factorization.

191920025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697912 (or 697907 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 191920025 is about 13853.5203107369. The cubic root of 191920025 is about 576.8197170618.

The spelling of 191920025 in words is "one hundred ninety-one million, nine hundred twenty thousand, twenty-five".