191669457 has 16 divisors (see below), whose sum is σ = 296071040. Its totient is φ = 108024192.

The previous prime is 191669449. The next prime is 191669461. The reversal of 191669457 is 754966191.

It is a happy number.

191669457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191669457 - 2³ = 191669449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191669057) 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, 60982 + ... + 64047.

It is an arithmetic number, because the mean of its divisors is an integer number (18504440).

Almost surely, 2^191669457 is an apocalyptic number.

It is an amenable number.

191669457 is a deficient number, since it is larger than the sum of its proper divisors (104401583).

191669457 is a wasteful number, since it uses less digits than its factorization.

191669457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125112.

The product of its digits is 408240, while the sum is 48.

The square root of 191669457 is about 13844.4738794943. The cubic root of 191669457 is about 576.5685785847.

The spelling of 191669457 in words is "one hundred ninety-one million, six hundred sixty-nine thousand, four hundred fifty-seven".