190521137 has 4 divisors (see below), whose sum is σ = 195168036. Its totient is φ = 185874240.

The previous prime is 190521101. The next prime is 190521157. The reversal of 190521137 is 731125091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 731125091 = 47 ⋅15555853.

It can be written as a sum of positive squares in 2 ways, for example, as 69872881 + 120648256 = 8359^2 + 10984^2 .

It is a cyclic number.

It is not a de Polignac number, because 190521137 - 2⁶ = 190521073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190521157) 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, 2323388 + ... + 2323469.

It is an arithmetic number, because the mean of its divisors is an integer number (48792009).

Almost surely, 2^190521137 is an apocalyptic number.

It is an amenable number.

190521137 is a deficient number, since it is larger than the sum of its proper divisors (4646899).

190521137 is an equidigital number, since it uses as much as digits as its factorization.

190521137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4646898.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 190521137 is about 13802.9394333236. The cubic root of 190521137 is about 575.4148356152.

The spelling of 190521137 in words is "one hundred ninety million, five hundred twenty-one thousand, one hundred thirty-seven".