149116821 has 16 divisors (see below), whose sum is σ = 227846784. Its totient is φ = 84976704.

The previous prime is 149116817. The next prime is 149116823. The reversal of 149116821 is 128611941.

It is not a de Polignac number, because 149116821 - 2² = 149116817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149116823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1686 + ... + 17351.

It is an arithmetic number, because the mean of its divisors is an integer number (14240424).

Almost surely, 2^149116821 is an apocalyptic number.

It is an amenable number.

149116821 is a deficient number, since it is larger than the sum of its proper divisors (78729963).

149116821 is a wasteful number, since it uses less digits than its factorization.

149116821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19420.

The product of its digits is 3456, while the sum is 33.

The square root of 149116821 is about 12211.3398527762. The cubic root of 149116821 is about 530.2844337747.

The spelling of 149116821 in words is "one hundred forty-nine million, one hundred sixteen thousand, eight hundred twenty-one".