71622979 has 2 divisors, whose sum is σ = 71622980. Its totient is φ = 71622978.

The previous prime is 71622977. The next prime is 71622983. The reversal of 71622979 is 97922617.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71622979 - 2¹ = 71622977 is a prime.

It is a super-2 number, since 2×71622979² = 10259702241668882, which contains 22 as substring.

Together with 71622977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71622977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35811489 + 35811490.

It is an arithmetic number, because the mean of its divisors is an integer number (35811490).

Almost surely, 2^71622979 is an apocalyptic number.

71622979 is a deficient number, since it is larger than the sum of its proper divisors (1).

71622979 is an equidigital number, since it uses as much as digits as its factorization.

71622979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 71622979 is about 8463.0360391529. The cubic root of 71622979 is about 415.2893496692.

The spelling of 71622979 in words is "seventy-one million, six hundred twenty-two thousand, nine hundred seventy-nine".