65550031 has 2 divisors, whose sum is σ = 65550032. Its totient is φ = 65550030.

The previous prime is 65549993. The next prime is 65550041. The reversal of 65550031 is 13005556.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65550031 is a prime.

It is a super-2 number, since 2×65550031² = 8593613128201922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65549978 and 65550005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65550041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32775015 + 32775016.

It is an arithmetic number, because the mean of its divisors is an integer number (32775016).

Almost surely, 2^65550031 is an apocalyptic number.

65550031 is a deficient number, since it is larger than the sum of its proper divisors (1).

65550031 is an equidigital number, since it uses as much as digits as its factorization.

65550031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 65550031 is about 8096.2973636101. The cubic root of 65550031 is about 403.2035066220.

Adding to 65550031 its reverse (13005556), we get a palindrome (78555587).

The spelling of 65550031 in words is "sixty-five million, five hundred fifty thousand, thirty-one".