190764521 has 4 divisors (see below), whose sum is σ = 190882692. Its totient is φ = 190646352.

The previous prime is 190764517. The next prime is 190764529. The reversal of 190764521 is 125467091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57592921 + 133171600 = 7589^2 + 11540^2 .

It is a cyclic number.

It is not a de Polignac number, because 190764521 - 2² = 190764517 is a prime.

It is a super-2 number, since 2×190764521² = 72782204944718882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190764529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56630 + ... + 59903.

It is an arithmetic number, because the mean of its divisors is an integer number (47720673).

Almost surely, 2^190764521 is an apocalyptic number.

It is an amenable number.

190764521 is a deficient number, since it is larger than the sum of its proper divisors (118171).

190764521 is a wasteful number, since it uses less digits than its factorization.

190764521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118170.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 190764521 is about 13811.7530024251. The cubic root of 190764521 is about 575.6597553721.

The spelling of 190764521 in words is "one hundred ninety million, seven hundred sixty-four thousand, five hundred twenty-one".