149212913 has 4 divisors (see below), whose sum is σ = 149298660. Its totient is φ = 149127168.

The previous prime is 149212901. The next prime is 149212933. The reversal of 149212913 is 319212941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319212941 = 239 ⋅1335619.

It can be written as a sum of positive squares in 2 ways, for example, as 111365809 + 37847104 = 10553^2 + 6152^2 .

It is a cyclic number.

It is not a de Polignac number, because 149212913 - 2¹⁴ = 149196529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 149212913.

It is not an unprimeable number, because it can be changed into a prime (149212933) 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, 40208 + ... + 43761.

It is an arithmetic number, because the mean of its divisors is an integer number (37324665).

Almost surely, 2^149212913 is an apocalyptic number.

It is an amenable number.

149212913 is a deficient number, since it is larger than the sum of its proper divisors (85747).

149212913 is an equidigital number, since it uses as much as digits as its factorization.

149212913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85746.

The product of its digits is 3888, while the sum is 32.

The square root of 149212913 is about 12215.2737587006. The cubic root of 149212913 is about 530.3983157407.

The spelling of 149212913 in words is "one hundred forty-nine million, two hundred twelve thousand, nine hundred thirteen".