103128631 has 4 divisors (see below), whose sum is σ = 103149000. Its totient is φ = 103108264.

The previous prime is 103128629. The next prime is 103128643. The reversal of 103128631 is 136821301.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 103128631 - 2¹ = 103128629 is a prime.

It is a super-2 number, since 2×103128631² = 21271029063868322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 103128596 and 103128605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103128601) 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, 3945 + ... + 14893.

It is an arithmetic number, because the mean of its divisors is an integer number (25787250).

Almost surely, 2^103128631 is an apocalyptic number.

103128631 is a deficient number, since it is larger than the sum of its proper divisors (20369).

103128631 is an equidigital number, since it uses as much as digits as its factorization.

103128631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20368.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 103128631 is about 10155.2267823028. The cubic root of 103128631 is about 468.9498675734.

Adding to 103128631 its reverse (136821301), we get a palindrome (239949932).

The spelling of 103128631 in words is "one hundred three million, one hundred twenty-eight thousand, six hundred thirty-one".