101315681 has 2 divisors, whose sum is σ = 101315682. Its totient is φ = 101315680.

The previous prime is 101315653. The next prime is 101315717. The reversal of 101315681 is 186513101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98704225 + 2611456 = 9935^2 + 1616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101315681 is a prime.

It is a super-2 number, since 2×101315681² = 20529734432987522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 101315681.

It is not a weakly prime, because it can be changed into another prime (101315281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50657840 + 50657841.

It is an arithmetic number, because the mean of its divisors is an integer number (50657841).

Almost surely, 2^101315681 is an apocalyptic number.

It is an amenable number.

101315681 is a deficient number, since it is larger than the sum of its proper divisors (1).

101315681 is an equidigital number, since it uses as much as digits as its factorization.

101315681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 101315681 is about 10065.5690847562. The cubic root of 101315681 is about 466.1856373863.

Adding to 101315681 its reverse (186513101), we get a palindrome (287828782).

The spelling of 101315681 in words is "one hundred one million, three hundred fifteen thousand, six hundred eighty-one".