149131693 has 4 divisors (see below), whose sum is σ = 150807420. Its totient is φ = 147455968.

The previous prime is 149131687. The next prime is 149131711. The reversal of 149131693 is 396131941.

149131693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 396131941 = 241 ⋅1643701.

It can be written as a sum of positive squares in 2 ways, for example, as 62678889 + 86452804 = 7917^2 + 9298^2 .

It is a cyclic number.

It is not a de Polignac number, because 149131693 - 2²⁵ = 115577261 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 (149131613) 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, 837730 + ... + 837907.

It is an arithmetic number, because the mean of its divisors is an integer number (37701855).

Almost surely, 2^149131693 is an apocalyptic number.

It is an amenable number.

149131693 is a deficient number, since it is larger than the sum of its proper divisors (1675727).

149131693 is an equidigital number, since it uses as much as digits as its factorization.

149131693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675726.

The product of its digits is 17496, while the sum is 37.

The square root of 149131693 is about 12211.9487797812. The cubic root of 149131693 is about 530.3020622977.

The spelling of 149131693 in words is "one hundred forty-nine million, one hundred thirty-one thousand, six hundred ninety-three".