71679961 has 2 divisors, whose sum is σ = 71679962. Its totient is φ = 71679960.

The previous prime is 71679919. The next prime is 71679991. The reversal of 71679961 is 16997617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50694400 + 20985561 = 7120^2 + 4581^2 .

It is a cyclic number.

It is not a de Polignac number, because 71679961 - 2⁷ = 71679833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71679901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35839980 + 35839981.

It is an arithmetic number, because the mean of its divisors is an integer number (35839981).

Almost surely, 2^71679961 is an apocalyptic number.

It is an amenable number.

71679961 is a deficient number, since it is larger than the sum of its proper divisors (1).

71679961 is an equidigital number, since it uses as much as digits as its factorization.

71679961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 46.

The square root of 71679961 is about 8466.4018921854. The cubic root of 71679961 is about 415.3994528105.

The spelling of 71679961 in words is "seventy-one million, six hundred seventy-nine thousand, nine hundred sixty-one".