191500961 has 4 divisors (see below), whose sum is σ = 194746800. Its totient is φ = 188255124.

The previous prime is 191500957. The next prime is 191500963. The reversal of 191500961 is 169005191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191500961 - 2² = 191500957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191500963) 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, 1622831 + ... + 1622948.

It is an arithmetic number, because the mean of its divisors is an integer number (48686700).

Almost surely, 2^191500961 is an apocalyptic number.

It is an amenable number.

191500961 is a deficient number, since it is larger than the sum of its proper divisors (3245839).

191500961 is an equidigital number, since it uses as much as digits as its factorization.

191500961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245838.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 191500961 is about 13838.3872253959. The cubic root of 191500961 is about 576.3995758606.

The spelling of 191500961 in words is "one hundred ninety-one million, five hundred thousand, nine hundred sixty-one".