149091821 has 8 divisors (see below), whose sum is σ = 152591040. Its totient is φ = 145633312.

The previous prime is 149091799. The next prime is 149091823. The reversal of 149091821 is 128190941.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 149091821 - 2²² = 144897517 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 (149091823) 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 7 ways as a sum of consecutive naturals, for example, 2705 + ... + 17478.

It is an arithmetic number, because the mean of its divisors is an integer number (19073880).

Almost surely, 2^149091821 is an apocalyptic number.

It is an amenable number.

149091821 is a deficient number, since it is larger than the sum of its proper divisors (3499219).

149091821 is an equidigital number, since it uses as much as digits as its factorization.

149091821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20355.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 149091821 is about 12210.3161711726. The cubic root of 149091821 is about 530.2547973869.

The spelling of 149091821 in words is "one hundred forty-nine million, ninety-one thousand, eight hundred twenty-one".