72149911 has 4 divisors (see below), whose sum is σ = 72295000. Its totient is φ = 72004824.

The previous prime is 72149893. The next prime is 72149929. The reversal of 72149911 is 11994127.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (72149893) and next prime (72149929).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72149911 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 (72149971) 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, 71796 + ... + 72793.

It is an arithmetic number, because the mean of its divisors is an integer number (18073750).

Almost surely, 2^72149911 is an apocalyptic number.

72149911 is a deficient number, since it is larger than the sum of its proper divisors (145089).

72149911 is a wasteful number, since it uses less digits than its factorization.

72149911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145088.

The product of its digits is 4536, while the sum is 34.

The square root of 72149911 is about 8494.1103713102. The cubic root of 72149911 is about 416.3052935712.

The spelling of 72149911 in words is "seventy-two million, one hundred forty-nine thousand, nine hundred eleven".