149642281 has 4 divisors (see below), whose sum is σ = 149880064. Its totient is φ = 149404500.

The previous prime is 149642263. The next prime is 149642287. The reversal of 149642281 is 182246941.

149642281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 149642281 - 2²¹ = 147545129 is a prime.

It is a super-2 number, since 2×149642281² = 44785624525765922, 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 149642281.

It is not an unprimeable number, because it can be changed into a prime (149642287) 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, 117945 + ... + 119206.

It is an arithmetic number, because the mean of its divisors is an integer number (37470016).

Almost surely, 2^149642281 is an apocalyptic number.

It is an amenable number.

149642281 is a deficient number, since it is larger than the sum of its proper divisors (237783).

149642281 is an equidigital number, since it uses as much as digits as its factorization.

149642281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237782.

The product of its digits is 27648, while the sum is 37.

The square root of 149642281 is about 12232.8361797255. The cubic root of 149642281 is about 530.9065782120.

The spelling of 149642281 in words is "one hundred forty-nine million, six hundred forty-two thousand, two hundred eighty-one".