75494821 has 2 divisors, whose sum is σ = 75494822. Its totient is φ = 75494820.

The previous prime is 75494819. The next prime is 75494857. The reversal of 75494821 is 12849457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61701025 + 13793796 = 7855^2 + 3714^2 .

It is a cyclic number.

It is not a de Polignac number, because 75494821 - 2¹ = 75494819 is a prime.

Together with 75494819, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75494621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37747410 + 37747411.

It is an arithmetic number, because the mean of its divisors is an integer number (37747411).

Almost surely, 2^75494821 is an apocalyptic number.

It is an amenable number.

75494821 is a deficient number, since it is larger than the sum of its proper divisors (1).

75494821 is an equidigital number, since it uses as much as digits as its factorization.

75494821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 75494821 is about 8688.7755754191. The cubic root of 75494821 is about 422.6417408960.

The spelling of 75494821 in words is "seventy-five million, four hundred ninety-four thousand, eight hundred twenty-one".