75705731 has 2 divisors, whose sum is σ = 75705732. Its totient is φ = 75705730.

The previous prime is 75705713. The next prime is 75705733. The reversal of 75705731 is 13750757.

Together with previous prime (75705713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75705731 is a prime.

It is a super-2 number, since 2×75705731² = 11462715412488722, which contains 22 as substring.

Together with 75705733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 75705691 and 75705700.

It is not a weakly prime, because it can be changed into another prime (75705733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37852865 + 37852866.

It is an arithmetic number, because the mean of its divisors is an integer number (37852866).

Almost surely, 2^75705731 is an apocalyptic number.

75705731 is a deficient number, since it is larger than the sum of its proper divisors (1).

75705731 is an equidigital number, since it uses as much as digits as its factorization.

75705731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25725, while the sum is 35.

The square root of 75705731 is about 8700.9040334899. The cubic root of 75705731 is about 423.0349532488.

The spelling of 75705731 in words is "seventy-five million, seven hundred five thousand, seven hundred thirty-one".