191230553 has 16 divisors (see below), whose sum is σ = 201601680. Its totient is φ = 181149696.

The previous prime is 191230549. The next prime is 191230561. The reversal of 191230553 is 355032191.

It can be written as a sum of positive squares in 8 ways, for example, as 21501769 + 169728784 = 4637^2 + 13028^2 .

It is a cyclic number.

It is not a de Polignac number, because 191230553 - 2² = 191230549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191230583) 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, 441425 + ... + 441857.

It is an arithmetic number, because the mean of its divisors is an integer number (12600105).

Almost surely, 2^191230553 is an apocalyptic number.

It is an amenable number.

191230553 is a deficient number, since it is larger than the sum of its proper divisors (10371127).

191230553 is a wasteful number, since it uses less digits than its factorization.

191230553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 191230553 is about 13828.6135602959. The cubic root of 191230553 is about 576.1281473254.

The spelling of 191230553 in words is "one hundred ninety-one million, two hundred thirty thousand, five hundred fifty-three".