72211639 has 2 divisors, whose sum is σ = 72211640. Its totient is φ = 72211638.

The previous prime is 72211621. The next prime is 72211709. The reversal of 72211639 is 93611227.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72211639 - 2⁷ = 72211511 is a prime.

It is a super-3 number, since 3×72211639³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is equal to p_4240498 and since 72211639 and 4240498 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72211639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72811639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36105819 + 36105820.

It is an arithmetic number, because the mean of its divisors is an integer number (36105820).

Almost surely, 2^72211639 is an apocalyptic number.

72211639 is a deficient number, since it is larger than the sum of its proper divisors (1).

72211639 is an equidigital number, since it uses as much as digits as its factorization.

72211639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 72211639 is about 8497.7431709837. The cubic root of 72211639 is about 416.4239833367.

The spelling of 72211639 in words is "seventy-two million, two hundred eleven thousand, six hundred thirty-nine".