72122081 has 4 divisors (see below), whose sum is σ = 75918000. Its totient is φ = 68326164.

The previous prime is 72122077. The next prime is 72122093. The reversal of 72122081 is 18022127.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18022127 = 19 ⋅948533.

It is a cyclic number.

It is not a de Polignac number, because 72122081 - 2² = 72122077 is a prime.

It is a super-2 number, since 2×72122081² = 10403189135541122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72121081) 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, 1897931 + ... + 1897968.

It is an arithmetic number, because the mean of its divisors is an integer number (18979500).

Almost surely, 2^72122081 is an apocalyptic number.

It is an amenable number.

72122081 is a deficient number, since it is larger than the sum of its proper divisors (3795919).

72122081 is a wasteful number, since it uses less digits than its factorization.

72122081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3795918.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 72122081 is about 8492.4720193828. The cubic root of 72122081 is about 416.2517602814.

The spelling of 72122081 in words is "seventy-two million, one hundred twenty-two thousand, eighty-one".