190778131 has 4 divisors (see below), whose sum is σ = 202000392. Its totient is φ = 179555872.

The previous prime is 190778113. The next prime is 190778141. The reversal of 190778131 is 131877091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131877091 = 53 ⋅2488247.

It is a cyclic number.

It is not a de Polignac number, because 190778131 - 2⁵ = 190778099 is a prime.

It is a super-2 number, since 2×190778131² = 72792590535706322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (190778101) 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, 5611105 + ... + 5611138.

It is an arithmetic number, because the mean of its divisors is an integer number (50500098).

Almost surely, 2^190778131 is an apocalyptic number.

190778131 is a deficient number, since it is larger than the sum of its proper divisors (11222261).

190778131 is a wasteful number, since it uses less digits than its factorization.

190778131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11222260.

The product of its (nonzero) digits is 10584, while the sum is 37.

The square root of 190778131 is about 13812.2456899666. The cubic root of 190778131 is about 575.6734450997.

The spelling of 190778131 in words is "one hundred ninety million, seven hundred seventy-eight thousand, one hundred thirty-one".