72355081 has 2 divisors, whose sum is σ = 72355082. Its totient is φ = 72355080.

The previous prime is 72355067. The next prime is 72355093. The reversal of 72355081 is 18055327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 1121481 = 8440^2 + 1059^2 .

It is an emirp because it is prime and its reverse (18055327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72355081 - 2¹⁹ = 71830793 is a prime.

It is a super-2 number, since 2×72355081² = 10470515493033122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72355981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36177540 + 36177541.

It is an arithmetic number, because the mean of its divisors is an integer number (36177541).

Almost surely, 2^72355081 is an apocalyptic number.

It is an amenable number.

72355081 is a deficient number, since it is larger than the sum of its proper divisors (1).

72355081 is an equidigital number, since it uses as much as digits as its factorization.

72355081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 72355081 is about 8506.1789894170. The cubic root of 72355081 is about 416.6995307056.

The spelling of 72355081 in words is "seventy-two million, three hundred fifty-five thousand, eighty-one".