101503813 has 4 divisors (see below), whose sum is σ = 101726380. Its totient is φ = 101281248.

The previous prime is 101503811. The next prime is 101503819. The reversal of 101503813 is 318305101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318305101 = 349 ⋅912049.

It can be written as a sum of positive squares in 2 ways, for example, as 80874049 + 20629764 = 8993^2 + 4542^2 .

It is a cyclic number.

It is not a de Polignac number, because 101503813 - 2¹ = 101503811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101503811) 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, 110598 + ... + 111511.

It is an arithmetic number, because the mean of its divisors is an integer number (25431595).

Almost surely, 2^101503813 is an apocalyptic number.

It is an amenable number.

101503813 is a deficient number, since it is larger than the sum of its proper divisors (222567).

101503813 is an equidigital number, since it uses as much as digits as its factorization.

101503813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222566.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 101503813 is about 10074.9100740404. The cubic root of 101503813 is about 466.4740106687.

Adding to 101503813 its reverse (318305101), we get a palindrome (419808914).

The spelling of 101503813 in words is "one hundred one million, five hundred three thousand, eight hundred thirteen".