71572939 has 2 divisors, whose sum is σ = 71572940. Its totient is φ = 71572938.

The previous prime is 71572933. The next prime is 71572967. The reversal of 71572939 is 93927517.

It is a weak prime.

It is an emirp because it is prime and its reverse (93927517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71572939 - 2³ = 71572931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71572895 and 71572904.

It is not a weakly prime, because it can be changed into another prime (71572931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35786469 + 35786470.

It is an arithmetic number, because the mean of its divisors is an integer number (35786470).

Almost surely, 2^71572939 is an apocalyptic number.

71572939 is a deficient number, since it is larger than the sum of its proper divisors (1).

71572939 is an equidigital number, since it uses as much as digits as its factorization.

71572939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119070, while the sum is 43.

The square root of 71572939 is about 8460.0791367457. The cubic root of 71572939 is about 415.1926119981.

The spelling of 71572939 in words is "seventy-one million, five hundred seventy-two thousand, nine hundred thirty-nine".