149431973 has 4 divisors (see below), whose sum is σ = 149462508. Its totient is φ = 149401440.

The previous prime is 149431967. The next prime is 149431981. The reversal of 149431973 is 379134941.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23251684 + 126180289 = 4822^2 + 11233^2 .

It is a cyclic number.

It is not a de Polignac number, because 149431973 - 2¹² = 149427877 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 149431973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149431993) 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, 6086 + ... + 18327.

It is an arithmetic number, because the mean of its divisors is an integer number (37365627).

Almost surely, 2^149431973 is an apocalyptic number.

It is an amenable number.

149431973 is a deficient number, since it is larger than the sum of its proper divisors (30535).

149431973 is an equidigital number, since it uses as much as digits as its factorization.

149431973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30534.

The product of its digits is 81648, while the sum is 41.

The square root of 149431973 is about 12224.2371132108. The cubic root of 149431973 is about 530.6577486987.

The spelling of 149431973 in words is "one hundred forty-nine million, four hundred thirty-one thousand, nine hundred seventy-three".