75961813 has 2 divisors, whose sum is σ = 75961814. Its totient is φ = 75961812.

The previous prime is 75961799. The next prime is 75961859. The reversal of 75961813 is 31816957.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68525284 + 7436529 = 8278^2 + 2727^2 .

It is an emirp because it is prime and its reverse (31816957) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75961813 - 2²⁵ = 42407381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75961883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37980906 + 37980907.

It is an arithmetic number, because the mean of its divisors is an integer number (37980907).

Almost surely, 2^75961813 is an apocalyptic number.

It is an amenable number.

75961813 is a deficient number, since it is larger than the sum of its proper divisors (1).

75961813 is an equidigital number, since it uses as much as digits as its factorization.

75961813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 75961813 is about 8715.6074372358. The cubic root of 75961813 is about 423.5114020683.

It can be divided in two parts, 7596 and 1813, that added together give a square (9409 = 97²).

The spelling of 75961813 in words is "seventy-five million, nine hundred sixty-one thousand, eight hundred thirteen".