258191191 has 4 divisors (see below), whose sum is σ = 258300432. Its totient is φ = 258081952.

The previous prime is 258191183. The next prime is 258191203. The reversal of 258191191 is 191191852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 258191191 - 2³ = 258191183 is a prime.

It is a super-2 number, since 2×258191191² = 133325382219996962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 258191191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258191891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50995 + ... + 55828.

It is an arithmetic number, because the mean of its divisors is an integer number (64575108).

Almost surely, 2^258191191 is an apocalyptic number.

258191191 is a deficient number, since it is larger than the sum of its proper divisors (109241).

258191191 is a wasteful number, since it uses less digits than its factorization.

258191191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109240.

The product of its digits is 6480, while the sum is 37.

The square root of 258191191 is about 16068.3288178952. The cubic root of 258191191 is about 636.7668904959.

It can be divided in two parts, 258 and 191191, that multiplied together give a triangular number (49327278 = T₉₉₃₂).

The spelling of 258191191 in words is "two hundred fifty-eight million, one hundred ninety-one thousand, one hundred ninety-one".