149269721 has 4 divisors (see below), whose sum is σ = 149346612. Its totient is φ = 149192832.

The previous prime is 149269717. The next prime is 149269787. The reversal of 149269721 is 127962941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127962941 = 73 ⋅1752917.

It can be written as a sum of positive squares in 2 ways, for example, as 37650496 + 111619225 = 6136^2 + 10565^2 .

It is a cyclic number.

It is not a de Polignac number, because 149269721 - 2² = 149269717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149269121) 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, 35456 + ... + 39441.

It is an arithmetic number, because the mean of its divisors is an integer number (37336653).

Almost surely, 2^149269721 is an apocalyptic number.

It is an amenable number.

149269721 is a deficient number, since it is larger than the sum of its proper divisors (76891).

149269721 is an equidigital number, since it uses as much as digits as its factorization.

149269721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76890.

The product of its digits is 54432, while the sum is 41.

The square root of 149269721 is about 12217.5988230094. The cubic root of 149269721 is about 530.4656178795.

The spelling of 149269721 in words is "one hundred forty-nine million, two hundred sixty-nine thousand, seven hundred twenty-one".