72281413 has 2 divisors, whose sum is σ = 72281414. Its totient is φ = 72281412.

The previous prime is 72281371. The next prime is 72281423. The reversal of 72281413 is 31418227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71267364 + 1014049 = 8442^2 + 1007^2 .

It is a cyclic number.

It is not a de Polignac number, because 72281413 - 2¹³ = 72273221 is a prime.

It is equal to p_4244356 and since 72281413 and 4244356 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72281423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36140706 + 36140707.

It is an arithmetic number, because the mean of its divisors is an integer number (36140707).

Almost surely, 2^72281413 is an apocalyptic number.

It is an amenable number.

72281413 is a deficient number, since it is larger than the sum of its proper divisors (1).

72281413 is an equidigital number, since it uses as much as digits as its factorization.

72281413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 72281413 is about 8501.8476227230. The cubic root of 72281413 is about 416.5580624325.

The spelling of 72281413 in words is "seventy-two million, two hundred eighty-one thousand, four hundred thirteen".