149121799 has 4 divisors (see below), whose sum is σ = 154263960. Its totient is φ = 143979640.

The previous prime is 149121793. The next prime is 149121821. The reversal of 149121799 is 997121941.

149121799 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.

It is a cyclic number.

It is not a de Polignac number, because 149121799 - 2¹³ = 149113607 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 (149121793) 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, 2571037 + ... + 2571094.

It is an arithmetic number, because the mean of its divisors is an integer number (38565990).

Almost surely, 2^149121799 is an apocalyptic number.

149121799 is a deficient number, since it is larger than the sum of its proper divisors (5142161).

149121799 is an equidigital number, since it uses as much as digits as its factorization.

149121799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142160.

The product of its digits is 40824, while the sum is 43.

The square root of 149121799 is about 12211.5436780122. The cubic root of 149121799 is about 530.2903345767.

The spelling of 149121799 in words is "one hundred forty-nine million, one hundred twenty-one thousand, seven hundred ninety-nine".