75645431 has 2 divisors, whose sum is σ = 75645432. Its totient is φ = 75645430.

The previous prime is 75645397. The next prime is 75645433. The reversal of 75645431 is 13454657.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75645431 is a prime.

It is a super-2 number, since 2×75645431² = 11444462462351522, which contains 22 as substring.

Together with 75645433, 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 = 75645391 and 75645400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75645433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37822715 + 37822716.

It is an arithmetic number, because the mean of its divisors is an integer number (37822716).

Almost surely, 2^75645431 is an apocalyptic number.

75645431 is a deficient number, since it is larger than the sum of its proper divisors (1).

75645431 is an equidigital number, since it uses as much as digits as its factorization.

75645431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 35.

The square root of 75645431 is about 8697.4381860408. The cubic root of 75645431 is about 422.9226069177.

The spelling of 75645431 in words is "seventy-five million, six hundred forty-five thousand, four hundred thirty-one".