71376561 has 12 divisors (see below), whose sum is σ = 103308660. Its totient is φ = 47487840.

The previous prime is 71376551. The next prime is 71376583. The reversal of 71376561 is 16567317.

It can be written as a sum of positive squares in 2 ways, for example, as 40640625 + 30735936 = 6375^2 + 5544^2 .

It is not a de Polignac number, because 71376561 - 2⁶ = 71376497 is a prime.

It is a super-2 number, since 2×71376561² = 10189226920373442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71376551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3210 + ... + 12371.

It is an arithmetic number, because the mean of its divisors is an integer number (8609055).

Almost surely, 2^71376561 is an apocalyptic number.

It is an amenable number.

71376561 is a deficient number, since it is larger than the sum of its proper divisors (31932099).

71376561 is a wasteful number, since it uses less digits than its factorization.

71376561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16096 (or 16093 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 71376561 is about 8448.4650085089. The cubic root of 71376561 is about 414.8125364186.

The spelling of 71376561 in words is "seventy-one million, three hundred seventy-six thousand, five hundred sixty-one".