149771297 has 4 divisors (see below), whose sum is σ = 161292180. Its totient is φ = 138250416.

The previous prime is 149771273. The next prime is 149771299. The reversal of 149771297 is 792177941.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 792177941 = 367 ⋅2158523.

It can be written as a sum of positive squares in 2 ways, for example, as 45751696 + 104019601 = 6764^2 + 10199^2 .

It is a cyclic number.

It is not a de Polignac number, because 149771297 - 2¹⁸ = 149509153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149771299) 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, 5760422 + ... + 5760447.

It is an arithmetic number, because the mean of its divisors is an integer number (40323045).

Almost surely, 2^149771297 is an apocalyptic number.

It is an amenable number.

149771297 is a deficient number, since it is larger than the sum of its proper divisors (11520883).

149771297 is a wasteful number, since it uses less digits than its factorization.

149771297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11520882.

The product of its digits is 222264, while the sum is 47.

The square root of 149771297 is about 12238.1083914141. The cubic root of 149771297 is about 531.0591103424.

The spelling of 149771297 in words is "one hundred forty-nine million, seven hundred seventy-one thousand, two hundred ninety-seven".