149454391 has 4 divisors (see below), whose sum is σ = 155952432. Its totient is φ = 142956352.

The previous prime is 149454353. The next prime is 149454427. The reversal of 149454391 is 193454941.

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 149454391 - 2⁹ = 149453879 is a prime.

It is a super-2 number, since 2×149454391² = 44673229978361762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149454341) 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, 3248986 + ... + 3249031.

It is an arithmetic number, because the mean of its divisors is an integer number (38988108).

Almost surely, 2^149454391 is an apocalyptic number.

149454391 is a deficient number, since it is larger than the sum of its proper divisors (6498041).

149454391 is an equidigital number, since it uses as much as digits as its factorization.

149454391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6498040.

The product of its digits is 77760, while the sum is 40.

The square root of 149454391 is about 12225.1540276595. The cubic root of 149454391 is about 530.6842840519.

The spelling of 149454391 in words is "one hundred forty-nine million, four hundred fifty-four thousand, three hundred ninety-one".