149253821 has 6 divisors (see below), whose sum is σ = 149840922. Its totient is φ = 148668320.

The previous prime is 149253791. The next prime is 149253833. The reversal of 149253821 is 128352941.

It can be written as a sum of positive squares in 3 ways, for example, as 657721 + 148596100 = 811^2 + 12190^2 .

It is not a de Polignac number, because 149253821 - 2⁶ = 149253757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149253851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 262025 + ... + 262593.

It is an arithmetic number, because the mean of its divisors is an integer number (24973487).

Almost surely, 2^149253821 is an apocalyptic number.

It is an amenable number.

149253821 is a deficient number, since it is larger than the sum of its proper divisors (587101).

149253821 is an frugal number, since it uses more digits than its factorization.

149253821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599 (or 1030 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 149253821 is about 12216.9481049892. The cubic root of 149253821 is about 530.4467823944.

The spelling of 149253821 in words is "one hundred forty-nine million, two hundred fifty-three thousand, eight hundred twenty-one".