65387731 has 2 divisors, whose sum is σ = 65387732. Its totient is φ = 65387730.

The previous prime is 65387723. The next prime is 65387737. The reversal of 65387731 is 13778356.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65387731 - 2³ = 65387723 is a prime.

It is a super-2 number, since 2×65387731² = 8551110730656722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65387737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32693865 + 32693866.

It is an arithmetic number, because the mean of its divisors is an integer number (32693866).

Almost surely, 2^65387731 is an apocalyptic number.

65387731 is a deficient number, since it is larger than the sum of its proper divisors (1).

65387731 is an equidigital number, since it uses as much as digits as its factorization.

65387731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 40.

The square root of 65387731 is about 8086.2680514561. The cubic root of 65387731 is about 402.8704581516.

The spelling of 65387731 in words is "sixty-five million, three hundred eighty-seven thousand, seven hundred thirty-one".