190307239545721 has 27 divisors (see below), whose sum is σ = 193288289891151. Its totient is φ = 187371995796624.

The previous prime is 190307239545707. The next prime is 190307239545799. The reversal of 190307239545721 is 127545932703091.

The square root of 190307239545721 is 13795189.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 177242918454121 + 13064321091600 = 13313261^2 + 3614460^2 .

It is not a de Polignac number, because 190307239545721 - 2⁹ = 190307239545209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190307239345721) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 338023515786 + ... + 338023516348.

Almost surely, 2^{190307239545721} is an apocalyptic number.

190307239545721 is the 13795189-th square number.

190307239545721 is the 6897595-th centered octagonal number.

It is an amenable number.

190307239545721 is a deficient number, since it is larger than the sum of its proper divisors (2981050345430).

190307239545721 is an frugal number, since it uses more digits than its factorization.

190307239545721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 14288400, while the sum is 58.

The spelling of 190307239545721 in words is "one hundred ninety trillion, three hundred seven billion, two hundred thirty-nine million, five hundred forty-five thousand, seven hundred twenty-one".