190974991 has 16 divisors (see below), whose sum is σ = 207277056. Its totient is φ = 175291776.

The previous prime is 190974989. The next prime is 190975013. The reversal of 190974991 is 199479091.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 190974991 - 2¹ = 190974989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190974961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121090 + ... + 122656.

It is an arithmetic number, because the mean of its divisors is an integer number (12954816).

Almost surely, 2^190974991 is an apocalyptic number.

190974991 is a deficient number, since it is larger than the sum of its proper divisors (16302065).

190974991 is a wasteful number, since it uses less digits than its factorization.

190974991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758.

The product of its (nonzero) digits is 183708, while the sum is 49.

The square root of 190974991 is about 13819.3701376003. The cubic root of 190974991 is about 575.8713855313.

The spelling of 190974991 in words is "one hundred ninety million, nine hundred seventy-four thousand, nine hundred ninety-one".