75494857 has 2 divisors, whose sum is σ = 75494858. Its totient is φ = 75494856.

The previous prime is 75494821. The next prime is 75494879. The reversal of 75494857 is 75849457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74373376 + 1121481 = 8624^2 + 1059^2 .

It is an emirp because it is prime and its reverse (75849457) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75494857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75494857.

It is not a weakly prime, because it can be changed into another prime (75494897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37747428 + 37747429.

It is an arithmetic number, because the mean of its divisors is an integer number (37747429).

Almost surely, 2^75494857 is an apocalyptic number.

It is an amenable number.

75494857 is a deficient number, since it is larger than the sum of its proper divisors (1).

75494857 is an equidigital number, since it uses as much as digits as its factorization.

75494857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1411200, while the sum is 49.

The square root of 75494857 is about 8688.7776470572. Note that the first 3 decimals coincide. The cubic root of 75494857 is about 422.6418080755.

The spelling of 75494857 in words is "seventy-five million, four hundred ninety-four thousand, eight hundred fifty-seven".