71646457 has 2 divisors, whose sum is σ = 71646458. Its totient is φ = 71646456.

The previous prime is 71646439. The next prime is 71646469. The reversal of 71646457 is 75464617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56715961 + 14930496 = 7531^2 + 3864^2 .

It is an emirp because it is prime and its reverse (75464617) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71646457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71646427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35823228 + 35823229.

It is an arithmetic number, because the mean of its divisors is an integer number (35823229).

Almost surely, 2^71646457 is an apocalyptic number.

It is an amenable number.

71646457 is a deficient number, since it is larger than the sum of its proper divisors (1).

71646457 is an equidigital number, since it uses as much as digits as its factorization.

71646457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 40.

The square root of 71646457 is about 8464.4230163668. The cubic root of 71646457 is about 415.3347219707.

The spelling of 71646457 in words is "seventy-one million, six hundred forty-six thousand, four hundred fifty-seven".