191900052 has 18 divisors (see below), whose sum is σ = 485080778. Its totient is φ = 63966672.

The previous prime is 191900003. The next prime is 191900053. The reversal of 191900052 is 250009191.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 189447696 + 2452356 = 13764^2 + 1566^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 191899989 and 191900025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191900053) 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, 2665243 + ... + 2665314.

Almost surely, 2^191900052 is an apocalyptic number.

191900052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

191900052 is an abundant number, since it is smaller than the sum of its proper divisors (293180726).

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

191900052 is a wasteful number, since it uses less digits than its factorization.

191900052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330567 (or 5330562 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 191900052 is about 13852.7994282744. The cubic root of 191900052 is about 576.7997066089.

The spelling of 191900052 in words is "one hundred ninety-one million, nine hundred thousand, fifty-two".