75439813 has 2 divisors, whose sum is σ = 75439814. Its totient is φ = 75439812.

The previous prime is 75439801. The next prime is 75439849. The reversal of 75439813 is 31893457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62204769 + 13235044 = 7887^2 + 3638^2 .

It is a cyclic number.

It is not a de Polignac number, because 75439813 - 2¹³ = 75431621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75439853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37719906 + 37719907.

It is an arithmetic number, because the mean of its divisors is an integer number (37719907).

Almost surely, 2^75439813 is an apocalyptic number.

It is an amenable number.

75439813 is a deficient number, since it is larger than the sum of its proper divisors (1).

75439813 is an equidigital number, since it uses as much as digits as its factorization.

75439813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 75439813 is about 8685.6095353176. The cubic root of 75439813 is about 422.5390657481.

The spelling of 75439813 in words is "seventy-five million, four hundred thirty-nine thousand, eight hundred thirteen".