72065121 has 4 divisors (see below), whose sum is σ = 96086832. Its totient is φ = 48043412.

The previous prime is 72065117. The next prime is 72065129. The reversal of 72065121 is 12156027.

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 72065121 - 2² = 72065117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72065091 and 72065100.

It is not an unprimeable number, because it can be changed into a prime (72065129) 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, 12010851 + ... + 12010856.

It is an arithmetic number, because the mean of its divisors is an integer number (24021708).

Almost surely, 2^72065121 is an apocalyptic number.

It is an amenable number.

72065121 is a deficient number, since it is larger than the sum of its proper divisors (24021711).

72065121 is a wasteful number, since it uses less digits than its factorization.

72065121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24021710.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 72065121 is about 8489.1177986879. The cubic root of 72065121 is about 416.1421500925.

The spelling of 72065121 in words is "seventy-two million, sixty-five thousand, one hundred twenty-one".