71223961 has 2 divisors, whose sum is σ = 71223962. Its totient is φ = 71223960.

The previous prime is 71223917. The next prime is 71223967. The reversal of 71223961 is 16932217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68227600 + 2996361 = 8260^2 + 1731^2 .

It is a cyclic number.

It is not a de Polignac number, because 71223961 - 2¹⁵ = 71191193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71223967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35611980 + 35611981.

It is an arithmetic number, because the mean of its divisors is an integer number (35611981).

Almost surely, 2^71223961 is an apocalyptic number.

It is an amenable number.

71223961 is a deficient number, since it is larger than the sum of its proper divisors (1).

71223961 is an equidigital number, since it uses as much as digits as its factorization.

71223961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 71223961 is about 8439.4289498757. The cubic root of 71223961 is about 414.5167084091.

The spelling of 71223961 in words is "seventy-one million, two hundred twenty-three thousand, nine hundred sixty-one".