149691539 has 4 divisors (see below), whose sum is σ = 150610056. Its totient is φ = 148773024.

The previous prime is 149691527. The next prime is 149691547. The reversal of 149691539 is 935196941.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 149691539 - 2⁴ = 149691523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 149691493 and 149691502.

It is not an unprimeable number, because it can be changed into a prime (149691589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459014 + ... + 459339.

It is an arithmetic number, because the mean of its divisors is an integer number (37652514).

Almost surely, 2^149691539 is an apocalyptic number.

149691539 is a deficient number, since it is larger than the sum of its proper divisors (918517).

149691539 is an equidigital number, since it uses as much as digits as its factorization.

149691539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918516.

The product of its digits is 262440, while the sum is 47.

The square root of 149691539 is about 12234.8493656440. The cubic root of 149691539 is about 530.9648249569.

The spelling of 149691539 in words is "one hundred forty-nine million, six hundred ninety-one thousand, five hundred thirty-nine".