190971925 has 6 divisors (see below), whose sum is σ = 236805218. Its totient is φ = 152777520.

The previous prime is 190971917. The next prime is 190971929. The reversal of 190971925 is 529179091.

It can be written as a sum of positive squares in 3 ways, for example, as 27311076 + 163660849 = 5226^2 + 12793^2 .

It is not a de Polignac number, because 190971925 - 2³ = 190971917 is a prime.

It is a super-2 number, since 2×190971925² = 72940552276411250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190971929) 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, 3819414 + ... + 3819463.

Almost surely, 2^190971925 is an apocalyptic number.

It is an amenable number.

190971925 is a deficient number, since it is larger than the sum of its proper divisors (45833293).

190971925 is an equidigital number, since it uses as much as digits as its factorization.

190971925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7638887 (or 7638882 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 43.

The square root of 190971925 is about 13819.2592059054. The cubic root of 190971925 is about 575.8683037471.

The spelling of 190971925 in words is "one hundred ninety million, nine hundred seventy-one thousand, nine hundred twenty-five".