149761647091 has 4 divisors (see below), whose sum is σ = 171156168112. Its totient is φ = 128367126072.

The previous prime is 149761647089. The next prime is 149761647097. The reversal of 149761647091 is 190746167941.

It is a happy number.

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 149761647091 - 2¹ = 149761647089 is a prime.

It is the 386991-st Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149761647097) by changing a digit.

It is a nontrivial repunit in base 386990.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10697260500 + ... + 10697260513.

It is an arithmetic number, because the mean of its divisors is an integer number (42789042028).

Almost surely, 2^149761647091 is an apocalyptic number.

149761647091 is a deficient number, since it is larger than the sum of its proper divisors (21394521021).

149761647091 is an equidigital number, since it uses as much as digits as its factorization.

149761647091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21394521020.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 149761647091 in words is "one hundred forty-nine billion, seven hundred sixty-one million, six hundred forty-seven thousand, ninety-one".