149971397 has 16 divisors (see below), whose sum is σ = 162058752. Its totient is φ = 138490560.

The previous prime is 149971387. The next prime is 149971411. The reversal of 149971397 is 793179941.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 149971397 - 2¹⁸ = 149709253 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 (149971337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59558 + ... + 62024.

It is an arithmetic number, because the mean of its divisors is an integer number (10128672).

Almost surely, 2^149971397 is an apocalyptic number.

It is an amenable number.

149971397 is a deficient number, since it is larger than the sum of its proper divisors (12087355).

149971397 is a wasteful number, since it uses less digits than its factorization.

149971397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588.

The product of its digits is 428652, while the sum is 50.

The square root of 149971397 is about 12246.2809456586. The cubic root of 149971397 is about 531.2955099744.

The spelling of 149971397 in words is "one hundred forty-nine million, nine hundred seventy-one thousand, three hundred ninety-seven".