149952821 has 4 divisors (see below), whose sum is σ = 150022092. Its totient is φ = 149883552.

The previous prime is 149952811. The next prime is 149952827. The reversal of 149952821 is 128259941.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52041796 + 97911025 = 7214^2 + 9895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149952821 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 (149952827) 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, 31280 + ... + 35753.

It is an arithmetic number, because the mean of its divisors is an integer number (37505523).

Almost surely, 2^149952821 is an apocalyptic number.

It is an amenable number.

149952821 is a deficient number, since it is larger than the sum of its proper divisors (69271).

149952821 is an equidigital number, since it uses as much as digits as its factorization.

149952821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69270.

The product of its digits is 51840, while the sum is 41.

The square root of 149952821 is about 12245.5224878320. The cubic root of 149952821 is about 531.2735730070.

The spelling of 149952821 in words is "one hundred forty-nine million, nine hundred fifty-two thousand, eight hundred twenty-one".