72191449 has 4 divisors (see below), whose sum is σ = 78754320. Its totient is φ = 65628580.

The previous prime is 72191407. The next prime is 72191461. The reversal of 72191449 is 94419127.

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 72191449 - 2⁷ = 72191321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72191479) 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, 3281419 + ... + 3281440.

It is an arithmetic number, because the mean of its divisors is an integer number (19688580).

Almost surely, 2^72191449 is an apocalyptic number.

It is an amenable number.

72191449 is a deficient number, since it is larger than the sum of its proper divisors (6562871).

72191449 is a wasteful number, since it uses less digits than its factorization.

72191449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6562870.

The product of its digits is 18144, while the sum is 37.

The square root of 72191449 is about 8496.5551254611. Note that the first 3 decimals coincide. The cubic root of 72191449 is about 416.3851697233.

It can be divided in two parts, 7219 and 1449, that added together give a palindrome (8668).

The spelling of 72191449 in words is "seventy-two million, one hundred ninety-one thousand, four hundred forty-nine".