72012197 has 4 divisors (see below), whose sum is σ = 72032940. Its totient is φ = 71991456.

The previous prime is 72012181. The next prime is 72012217. The reversal of 72012197 is 79121027.

It is a Cunningham number, because it is equal to 8486²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79121027 = 419 ⋅188833.

It can be written as a sum of positive squares in 2 ways, for example, as 5410276 + 66601921 = 2326^2 + 8161^2 .

It is a cyclic number.

It is not a de Polignac number, because 72012197 - 2⁴ = 72012181 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 (72012137) 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, 3758 + ... + 12575.

It is an arithmetic number, because the mean of its divisors is an integer number (18008235).

Almost surely, 2^72012197 is an apocalyptic number.

It is an amenable number.

72012197 is a deficient number, since it is larger than the sum of its proper divisors (20743).

72012197 is a wasteful number, since it uses less digits than its factorization.

72012197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20742.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 72012197 is about 8486.0000589206. Note that the first 4 decimals coincide. The cubic root of 72012197 is about 416.0402547492.

The spelling of 72012197 in words is "seventy-two million, twelve thousand, one hundred ninety-seven".