75451993 has 2 divisors, whose sum is σ = 75451994. Its totient is φ = 75451992.

The previous prime is 75451979. The next prime is 75452009. The reversal of 75451993 is 39915457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72114064 + 3337929 = 8492^2 + 1827^2 .

It is an emirp because it is prime and its reverse (39915457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75451993 - 2²⁵ = 41897561 is a prime.

It is not a weakly prime, because it can be changed into another prime (75451903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37725996 + 37725997.

It is an arithmetic number, because the mean of its divisors is an integer number (37725997).

Almost surely, 2^75451993 is an apocalyptic number.

It is an amenable number.

75451993 is a deficient number, since it is larger than the sum of its proper divisors (1).

75451993 is an equidigital number, since it uses as much as digits as its factorization.

75451993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 43.

The square root of 75451993 is about 8686.3106667906. The cubic root of 75451993 is about 422.5618046206.

The spelling of 75451993 in words is "seventy-five million, four hundred fifty-one thousand, nine hundred ninety-three".