189251905 has 8 divisors (see below), whose sum is σ = 240461352. Its totient is φ = 142495488.

The previous prime is 189251893. The next prime is 189251917. The reversal of 189251905 is 509152981.

It is an interprime number because it is at equal distance from previous prime (189251893) and next prime (189251917).

It can be written as a sum of positive squares in 4 ways, for example, as 13927824 + 175324081 = 3732^2 + 13241^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189251905 - 2⁵ = 189251873 is a prime.

It is a super-2 number, since 2×189251905² = 71632567092258050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1113162 + ... + 1113331.

It is an arithmetic number, because the mean of its divisors is an integer number (30057669).

Almost surely, 2^189251905 is an apocalyptic number.

It is an amenable number.

189251905 is a deficient number, since it is larger than the sum of its proper divisors (51209447).

189251905 is a wasteful number, since it uses less digits than its factorization.

189251905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226515.

The product of its (nonzero) digits is 32400, while the sum is 40.

The square root of 189251905 is about 13756.8857304261. The cubic root of 189251905 is about 574.1342029805.

The spelling of 189251905 in words is "one hundred eighty-nine million, two hundred fifty-one thousand, nine hundred five".