72169501 has 4 divisors (see below), whose sum is σ = 72207100. Its totient is φ = 72131904.

The previous prime is 72169483. The next prime is 72169507. The reversal of 72169501 is 10596127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10596127 = 61 ⋅173707.

It can be written as a sum of positive squares in 2 ways, for example, as 71064900 + 1104601 = 8430^2 + 1051^2 .

It is a cyclic number.

It is not a de Polignac number, because 72169501 - 2⁷ = 72169373 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 (72169507) 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, 15756 + ... + 19813.

It is an arithmetic number, because the mean of its divisors is an integer number (18051775).

Almost surely, 2^72169501 is an apocalyptic number.

It is an amenable number.

72169501 is a deficient number, since it is larger than the sum of its proper divisors (37599).

72169501 is a wasteful number, since it uses less digits than its factorization.

72169501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37598.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 72169501 is about 8495.2634450028. The cubic root of 72169501 is about 416.3429682894.

The spelling of 72169501 in words is "seventy-two million, one hundred sixty-nine thousand, five hundred one".