149290561 has 4 divisors (see below), whose sum is σ = 170617792. Its totient is φ = 127963332.

The previous prime is 149290541. The next prime is 149290627. The reversal of 149290561 is 165092941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 149290561 - 2¹⁵ = 149257793 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a pancake number, because a pancake can be divided into 149290561 parts by 17279 straight cuts.

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 149290561.

It is not an unprimeable number, because it can be changed into a prime (149290511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10663605 + ... + 10663618.

It is an arithmetic number, because the mean of its divisors is an integer number (42654448).

Almost surely, 2^149290561 is an apocalyptic number.

It is an amenable number.

149290561 is a deficient number, since it is larger than the sum of its proper divisors (21327231).

149290561 is an equidigital number, since it uses as much as digits as its factorization.

149290561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21327230.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 149290561 is about 12218.4516613194. The cubic root of 149290561 is about 530.4903033704.

The spelling of 149290561 in words is "one hundred forty-nine million, two hundred ninety thousand, five hundred sixty-one".