75122681 has 2 divisors, whose sum is σ = 75122682. Its totient is φ = 75122680.

The previous prime is 75122653. The next prime is 75122683. The reversal of 75122681 is 18622157.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74978281 + 144400 = 8659^2 + 380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75122681 is a prime.

It is a super-2 number, since 2×75122681² = 11286834401255522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 75122683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (75122683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37561340 + 37561341.

It is an arithmetic number, because the mean of its divisors is an integer number (37561341).

Almost surely, 2^75122681 is an apocalyptic number.

It is an amenable number.

75122681 is a deficient number, since it is larger than the sum of its proper divisors (1).

75122681 is an equidigital number, since it uses as much as digits as its factorization.

75122681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 75122681 is about 8667.3341345537. The cubic root of 75122681 is about 421.9461477518.

It can be divided in two parts, 751 and 22681, that added together give a palindrome (23432).

The spelling of 75122681 in words is "seventy-five million, one hundred twenty-two thousand, six hundred eighty-one".