72101971 has 2 divisors, whose sum is σ = 72101972. Its totient is φ = 72101970.

The previous prime is 72101969. The next prime is 72101993. The reversal of 72101971 is 17910127.

It is a weak prime.

It is an emirp because it is prime and its reverse (17910127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72101971 - 2¹ = 72101969 is a prime.

Together with 72101969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72101951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36050985 + 36050986.

It is an arithmetic number, because the mean of its divisors is an integer number (36050986).

Almost surely, 2^72101971 is an apocalyptic number.

72101971 is a deficient number, since it is larger than the sum of its proper divisors (1).

72101971 is an equidigital number, since it uses as much as digits as its factorization.

72101971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 72101971 is about 8491.2879470667. The cubic root of 72101971 is about 416.2130684738.

The spelling of 72101971 in words is "seventy-two million, one hundred one thousand, nine hundred seventy-one".