65723431 has 2 divisors, whose sum is σ = 65723432. Its totient is φ = 65723430.

The previous prime is 65723429. The next prime is 65723459. The reversal of 65723431 is 13432756.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65723431 - 2¹ = 65723429 is a prime.

It is a super-2 number, since 2×65723431² = 8639138764823522, which contains 22 as substring.

Together with 65723429, it forms a pair of twin primes.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 65723393 and 65723402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65723401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32861715 + 32861716.

It is an arithmetic number, because the mean of its divisors is an integer number (32861716).

Almost surely, 2^65723431 is an apocalyptic number.

65723431 is a deficient number, since it is larger than the sum of its proper divisors (1).

65723431 is an equidigital number, since it uses as much as digits as its factorization.

65723431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 31.

The square root of 65723431 is about 8106.9988898482. The cubic root of 65723431 is about 403.5587260277.

The spelling of 65723431 in words is "sixty-five million, seven hundred twenty-three thousand, four hundred thirty-one".