149986391 has 4 divisors (see below), whose sum is σ = 150647352. Its totient is φ = 149325432.

The previous prime is 149986363. The next prime is 149986433. The reversal of 149986391 is 193689941.

149986391 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.

It is a cyclic number.

It is not a de Polignac number, because 149986391 - 2⁶ = 149986327 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 (149986301) 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, 330140 + ... + 330593.

It is an arithmetic number, because the mean of its divisors is an integer number (37661838).

Almost surely, 2^149986391 is an apocalyptic number.

149986391 is a deficient number, since it is larger than the sum of its proper divisors (660961).

149986391 is an equidigital number, since it uses as much as digits as its factorization.

149986391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660960.

The product of its digits is 419904, while the sum is 50.

The square root of 149986391 is about 12246.8931162152. The cubic root of 149986391 is about 531.3132155270.

The spelling of 149986391 in words is "one hundred forty-nine million, nine hundred eighty-six thousand, three hundred ninety-one".