149231557 has 4 divisors (see below), whose sum is σ = 149478016. Its totient is φ = 148985100.

The previous prime is 149231539. The next prime is 149231561. The reversal of 149231557 is 755132941.

149231557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149231557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149231527) 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, 122319 + ... + 123532.

It is an arithmetic number, because the mean of its divisors is an integer number (37369504).

Almost surely, 2^149231557 is an apocalyptic number.

It is an amenable number.

149231557 is a deficient number, since it is larger than the sum of its proper divisors (246459).

149231557 is an equidigital number, since it uses as much as digits as its factorization.

149231557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246458.

The product of its digits is 37800, while the sum is 37.

The square root of 149231557 is about 12216.0368778094. The cubic root of 149231557 is about 530.4204057287.

The spelling of 149231557 in words is "one hundred forty-nine million, two hundred thirty-one thousand, five hundred fifty-seven".