149911591 has 2 divisors, whose sum is σ = 149911592. Its totient is φ = 149911590.

The previous prime is 149911583. The next prime is 149911633. The reversal of 149911591 is 195119941.

It is a weak prime.

It is an emirp because it is prime and its reverse (195119941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149911591 - 2³ = 149911583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149911561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74955795 + 74955796.

It is an arithmetic number, because the mean of its divisors is an integer number (74955796).

Almost surely, 2^149911591 is an apocalyptic number.

149911591 is a deficient number, since it is larger than the sum of its proper divisors (1).

149911591 is an equidigital number, since it uses as much as digits as its factorization.

149911591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 40.

The square root of 149911591 is about 12243.8388996262. The cubic root of 149911591 is about 531.2248767635.

The spelling of 149911591 in words is "one hundred forty-nine million, nine hundred eleven thousand, five hundred ninety-one".