65990031 has 8 divisors (see below), whose sum is σ = 88241664. Its totient is φ = 43865880.

The previous prime is 65990011. The next prime is 65990053. The reversal of 65990031 is 13009956.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65990031 - 2⁵ = 65989999 is a prime.

It is a super-2 number, since 2×65990031² = 8709368382761922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65989974 and 65990001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65990011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30655 + ... + 32736.

It is an arithmetic number, because the mean of its divisors is an integer number (11030208).

Almost surely, 2^65990031 is an apocalyptic number.

65990031 is a deficient number, since it is larger than the sum of its proper divisors (22251633).

65990031 is a wasteful number, since it uses less digits than its factorization.

65990031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63741.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 65990031 is about 8123.4248319290. The cubic root of 65990031 is about 404.1036540065.

Adding to 65990031 its reverse (13009956), we get a palindrome (78999987).

The spelling of 65990031 in words is "sixty-five million, nine hundred ninety thousand, thirty-one".