148990591 has 4 divisors (see below), whose sum is σ = 151031632. Its totient is φ = 146949552.

The previous prime is 148990577. The next prime is 148990627. The reversal of 148990591 is 195099841.

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 148990591 - 2⁵ = 148990559 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 (148990511) 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, 1020411 + ... + 1020556.

It is an arithmetic number, because the mean of its divisors is an integer number (37757908).

Almost surely, 2^148990591 is an apocalyptic number.

148990591 is a deficient number, since it is larger than the sum of its proper divisors (2041041).

148990591 is an equidigital number, since it uses as much as digits as its factorization.

148990591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041040.

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 148990591 is about 12206.1702019921. The cubic root of 148990591 is about 530.1347598467.

The spelling of 148990591 in words is "one hundred forty-eight million, nine hundred ninety thousand, five hundred ninety-one".