149220791 has 4 divisors (see below), whose sum is σ = 149506632. Its totient is φ = 148934952.

The previous prime is 149220779. The next prime is 149220821. The reversal of 149220791 is 197022941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197022941 = 71 ⋅2774971.

It is a cyclic number.

It is not a de Polignac number, because 149220791 - 2²⁶ = 82111927 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 (149220691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142136 + ... + 143181.

It is an arithmetic number, because the mean of its divisors is an integer number (37376658).

Almost surely, 2^149220791 is an apocalyptic number.

149220791 is a deficient number, since it is larger than the sum of its proper divisors (285841).

149220791 is an equidigital number, since it uses as much as digits as its factorization.

149220791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285840.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 149220791 is about 12215.5962195875. The cubic root of 149220791 is about 530.4076500633.

The spelling of 149220791 in words is "one hundred forty-nine million, two hundred twenty thousand, seven hundred ninety-one".