71980147 has 2 divisors, whose sum is σ = 71980148. Its totient is φ = 71980146.

The previous prime is 71980127. The next prime is 71980157. The reversal of 71980147 is 74108917.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71980147 - 2⁷ = 71980019 is a prime.

It is a super-2 number, since 2×71980147² = 10362283124283218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71980127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35990073 + 35990074.

It is an arithmetic number, because the mean of its divisors is an integer number (35990074).

Almost surely, 2^71980147 is an apocalyptic number.

71980147 is a deficient number, since it is larger than the sum of its proper divisors (1).

71980147 is an equidigital number, since it uses as much as digits as its factorization.

71980147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 71980147 is about 8484.1114443411. Note that the first 3 decimals coincide. The cubic root of 71980147 is about 415.9785241471.

It can be divided in two parts, 71980 and 147, that added together give a palindrome (72127).

The spelling of 71980147 in words is "seventy-one million, nine hundred eighty thousand, one hundred forty-seven".