149704721 has 4 divisors (see below), whose sum is σ = 149924592. Its totient is φ = 149484852.

The previous prime is 149704691. The next prime is 149704747. The reversal of 149704721 is 127407941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 149704721 - 2⁶ = 149704657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (149703721) 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, 108911 + ... + 110276.

It is an arithmetic number, because the mean of its divisors is an integer number (37481148).

Almost surely, 2^149704721 is an apocalyptic number.

It is an amenable number.

149704721 is a deficient number, since it is larger than the sum of its proper divisors (219871).

149704721 is an equidigital number, since it uses as much as digits as its factorization.

149704721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219870.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 149704721 is about 12235.3880608667. The cubic root of 149704721 is about 530.9804102798.

It can be divided in two parts, 14970 and 4721, that added together give a palindrome (19691).

The spelling of 149704721 in words is "one hundred forty-nine million, seven hundred four thousand, seven hundred twenty-one".