72145149 has 4 divisors (see below), whose sum is σ = 96193536. Its totient is φ = 48096764.

The previous prime is 72145121. The next prime is 72145163. The reversal of 72145149 is 94154127.

It is a happy number.

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 72145149 - 2⁸ = 72144893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72146149) 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, 12024189 + ... + 12024194.

It is an arithmetic number, because the mean of its divisors is an integer number (24048384).

Almost surely, 2^72145149 is an apocalyptic number.

It is an amenable number.

72145149 is a deficient number, since it is larger than the sum of its proper divisors (24048387).

72145149 is a wasteful number, since it uses less digits than its factorization.

72145149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24048386.

The product of its digits is 10080, while the sum is 33.

The square root of 72145149 is about 8493.8300548104. The cubic root of 72145149 is about 416.2961344496.

The spelling of 72145149 in words is "seventy-two million, one hundred forty-five thousand, one hundred forty-nine".