103648721 has 12 divisors (see below), whose sum is σ = 114712500. Its totient is φ = 93577440.

The previous prime is 103648681. The next prime is 103648733. The reversal of 103648721 is 127846301.

It can be written as a sum of positive squares in 2 ways, for example, as 5856400 + 97792321 = 2420^2 + 9889^2 .

It is a de Polignac number, because none of the positive numbers 2^k-103648721 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 (103648751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15155 + ... + 20903.

It is an arithmetic number, because the mean of its divisors is an integer number (9559375).

Almost surely, 2^103648721 is an apocalyptic number.

103648721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

103648721 is a deficient number, since it is larger than the sum of its proper divisors (11063779).

103648721 is a wasteful number, since it uses less digits than its factorization.

103648721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5920 (or 5909 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 103648721 is about 10180.8015892659. The cubic root of 103648721 is about 469.7368694629.

The spelling of 103648721 in words is "one hundred three million, six hundred forty-eight thousand, seven hundred twenty-one".