72207481 has 2 divisors, whose sum is σ = 72207482. Its totient is φ = 72207480.

The previous prime is 72207433. The next prime is 72207523. The reversal of 72207481 is 18470227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65755881 + 6451600 = 8109^2 + 2540^2 .

It is a cyclic number.

It is not a de Polignac number, because 72207481 - 2¹⁷ = 72076409 is a prime.

It is a super-2 number, since 2×72207481² = 10427840624730722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72204481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36103740 + 36103741.

It is an arithmetic number, because the mean of its divisors is an integer number (36103741).

Almost surely, 2^72207481 is an apocalyptic number.

It is an amenable number.

72207481 is a deficient number, since it is larger than the sum of its proper divisors (1).

72207481 is an equidigital number, since it uses as much as digits as its factorization.

72207481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 72207481 is about 8497.4985142688. The cubic root of 72207481 is about 416.4159905155.

The spelling of 72207481 in words is "seventy-two million, two hundred seven thousand, four hundred eighty-one".