149211831 has 4 divisors (see below), whose sum is σ = 198949112. Its totient is φ = 99474552.

The previous prime is 149211761. The next prime is 149211841. The reversal of 149211831 is 138112941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138112941 = 3 ⋅46037647.

It is not a de Polignac number, because 149211831 - 2²⁷ = 14994103 is a prime.

It is a super-2 number, since 2×149211831² = 44528341020745122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149211841) 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, 24868636 + ... + 24868641.

It is an arithmetic number, because the mean of its divisors is an integer number (49737278).

Almost surely, 2^149211831 is an apocalyptic number.

149211831 is a deficient number, since it is larger than the sum of its proper divisors (49737281).

149211831 is an equidigital number, since it uses as much as digits as its factorization.

149211831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49737280.

The product of its digits is 1728, while the sum is 30.

The square root of 149211831 is about 12215.2294698053. The cubic root of 149211831 is about 530.3970336971.

The spelling of 149211831 in words is "one hundred forty-nine million, two hundred eleven thousand, eight hundred thirty-one".