71922131 has 2 divisors, whose sum is σ = 71922132. Its totient is φ = 71922130.

The previous prime is 71922061. The next prime is 71922133. The reversal of 71922131 is 13122917.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71922131 is a prime.

It is a super-2 number, since 2×71922131² = 10345585855162322, which contains 22 as substring.

Together with 71922133, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71922131.

It is not a weakly prime, because it can be changed into another prime (71922133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35961065 + 35961066.

It is an arithmetic number, because the mean of its divisors is an integer number (35961066).

Almost surely, 2^71922131 is an apocalyptic number.

71922131 is a deficient number, since it is larger than the sum of its proper divisors (1).

71922131 is an equidigital number, since it uses as much as digits as its factorization.

71922131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 26.

The square root of 71922131 is about 8480.6916581137. The cubic root of 71922131 is about 415.8667345412.

The spelling of 71922131 in words is "seventy-one million, nine hundred twenty-two thousand, one hundred thirty-one".