72571771 has 2 divisors, whose sum is σ = 72571772. Its totient is φ = 72571770.

The previous prime is 72571753. The next prime is 72571781. The reversal of 72571771 is 17717527.

It is a strong prime.

It is an emirp because it is prime and its reverse (17717527) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72571771 - 2⁷ = 72571643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72571771.

It is not a weakly prime, because it can be changed into another prime (72571721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36285885 + 36285886.

It is an arithmetic number, because the mean of its divisors is an integer number (36285886).

Almost surely, 2^72571771 is an apocalyptic number.

72571771 is a deficient number, since it is larger than the sum of its proper divisors (1).

72571771 is an equidigital number, since it uses as much as digits as its factorization.

72571771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24010, while the sum is 37.

The square root of 72571771 is about 8518.9066786766. The cubic root of 72571771 is about 417.1150953128.

The spelling of 72571771 in words is "seventy-two million, five hundred seventy-one thousand, seven hundred seventy-one".