101009681 has 4 divisors (see below), whose sum is σ = 106326000. Its totient is φ = 95693364.

The previous prime is 101009663. The next prime is 101009723. The reversal of 101009681 is 186900101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 101009681 - 2⁶ = 101009617 is a prime.

It is a super-2 number, since 2×101009681² = 20405911311443522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101009681.

It is not an unprimeable number, because it can be changed into a prime (101009611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2658131 + ... + 2658168.

It is an arithmetic number, because the mean of its divisors is an integer number (26581500).

Almost surely, 2^101009681 is an apocalyptic number.

It is an amenable number.

101009681 is a deficient number, since it is larger than the sum of its proper divisors (5316319).

101009681 is an equidigital number, since it uses as much as digits as its factorization.

101009681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5316318.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 101009681 is about 10050.3572573317. The cubic root of 101009681 is about 465.7158296809.

Adding to 101009681 its reverse (186900101), we get a palindrome (287909782).

The spelling of 101009681 in words is "one hundred one million, nine thousand, six hundred eighty-one".