71554979 has 2 divisors, whose sum is σ = 71554980. Its totient is φ = 71554978.

The previous prime is 71554957. The next prime is 71554993. The reversal of 71554979 is 97945517.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71554979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71554939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35777489 + 35777490.

It is an arithmetic number, because the mean of its divisors is an integer number (35777490).

Almost surely, 2^71554979 is an apocalyptic number.

71554979 is a deficient number, since it is larger than the sum of its proper divisors (1).

71554979 is an equidigital number, since it uses as much as digits as its factorization.

71554979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 396900, while the sum is 47.

The square root of 71554979 is about 8459.0176143569. The cubic root of 71554979 is about 415.1578806074.

It can be divided in two parts, 71554 and 979, that multiplied together give a triangular number (70051366 = T₁₁₈₃₆).

The spelling of 71554979 in words is "seventy-one million, five hundred fifty-four thousand, nine hundred seventy-nine".