149281919 has 4 divisors (see below), whose sum is σ = 149323896. Its totient is φ = 149239944.

The previous prime is 149281877. The next prime is 149281921. The reversal of 149281919 is 919182941.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149281919 is a prime.

It is a super-2 number, since 2×149281919² = 44570182680645122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 149281919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149281949) 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, 15104 + ... + 22949.

It is an arithmetic number, because the mean of its divisors is an integer number (37330974).

Almost surely, 2^149281919 is an apocalyptic number.

149281919 is a deficient number, since it is larger than the sum of its proper divisors (41977).

149281919 is an equidigital number, since it uses as much as digits as its factorization.

149281919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41976.

The product of its digits is 46656, while the sum is 44.

The square root of 149281919 is about 12218.0980107380. The cubic root of 149281919 is about 530.4800669884.

The spelling of 149281919 in words is "one hundred forty-nine million, two hundred eighty-one thousand, nine hundred nineteen".