149894891 has 4 divisors (see below), whose sum is σ = 153084192. Its totient is φ = 146705592.

The previous prime is 149894867. The next prime is 149894903. The reversal of 149894891 is 198498941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198498941 = 61 ⋅3254081.

It is a cyclic number.

It is not a de Polignac number, because 149894891 - 2¹⁰ = 149893867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149894821) 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, 1594580 + ... + 1594673.

It is an arithmetic number, because the mean of its divisors is an integer number (38271048).

Almost surely, 2^149894891 is an apocalyptic number.

149894891 is a deficient number, since it is larger than the sum of its proper divisors (3189301).

149894891 is an equidigital number, since it uses as much as digits as its factorization.

149894891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189300.

The product of its digits is 746496, while the sum is 53.

The square root of 149894891 is about 12243.1569049817. The cubic root of 149894891 is about 531.2051500592.

The spelling of 149894891 in words is "one hundred forty-nine million, eight hundred ninety-four thousand, eight hundred ninety-one".