149831997 has 8 divisors (see below), whose sum is σ = 228315456. Its totient is φ = 85618272.

The previous prime is 149831987. The next prime is 149832041. The reversal of 149831997 is 799138941.

It is a happy number.

149831997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 149831997 - 2⁸ = 149831741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149831947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3567408 + ... + 3567449.

It is an arithmetic number, because the mean of its divisors is an integer number (28539432).

Almost surely, 2^149831997 is an apocalyptic number.

It is an amenable number.

149831997 is a deficient number, since it is larger than the sum of its proper divisors (78483459).

149831997 is an equidigital number, since it uses as much as digits as its factorization.

149831997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7134867.

The product of its digits is 489888, while the sum is 51.

The square root of 149831997 is about 12240.5880986168. The cubic root of 149831997 is about 531.1308440119.

The spelling of 149831997 in words is "one hundred forty-nine million, eight hundred thirty-one thousand, nine hundred ninety-seven".