191618145 has 12 divisors (see below), whose sum is σ = 332138196. Its totient is φ = 102196320.

The previous prime is 191618131. The next prime is 191618149. The reversal of 191618145 is 541816191.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 62204769 + 129413376 = 7887^2 + 11376^2 .

It is not a de Polignac number, because 191618145 - 2⁵ = 191618113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191618149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2129046 + ... + 2129135.

It is an arithmetic number, because the mean of its divisors is an integer number (27678183).

Almost surely, 2^191618145 is an apocalyptic number.

191618145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191618145 is a deficient number, since it is larger than the sum of its proper divisors (140520051).

191618145 is a wasteful number, since it uses less digits than its factorization.

191618145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4258192 (or 4258189 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 191618145 is about 13842.6205972713. The cubic root of 191618145 is about 576.5171227645.

The spelling of 191618145 in words is "one hundred ninety-one million, six hundred eighteen thousand, one hundred forty-five".