72130501 has 4 divisors (see below), whose sum is σ = 74080012. Its totient is φ = 70180992.

The previous prime is 72130493. The next prime is 72130529. The reversal of 72130501 is 10503127.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45360225 + 26770276 = 6735^2 + 5174^2 .

It is a cyclic number.

It is not a de Polignac number, because 72130501 - 2³ = 72130493 is a prime.

It is a super-2 number, since 2×72130501² = 10405618349022002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72130301) 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, 974700 + ... + 974773.

It is an arithmetic number, because the mean of its divisors is an integer number (18520003).

Almost surely, 2^72130501 is an apocalyptic number.

It is an amenable number.

72130501 is a deficient number, since it is larger than the sum of its proper divisors (1949511).

72130501 is a wasteful number, since it uses less digits than its factorization.

72130501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949510.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 72130501 is about 8492.9677380760. The cubic root of 72130501 is about 416.2679582954.

Adding to 72130501 its reverse (10503127), we get a palindrome (82633628).

The spelling of 72130501 in words is "seventy-two million, one hundred thirty thousand, five hundred one".