13121031 has 32 divisors (see below), whose sum is σ = 22118400. Its totient is φ = 6720480.

The previous prime is 13120999. The next prime is 13121033. The reversal of 13121031 is 13012131.

It is not a de Polignac number, because 13121031 - 2⁵ = 13120999 is a prime.

It is a super-2 number, since 2×13121031² = 344322909005922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13120998 and 13121016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121033) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17890 + ... + 18608.

It is an arithmetic number, because the mean of its divisors is an integer number (691200).

Almost surely, 2^13121031 is an apocalyptic number.

13121031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13121031 is a deficient number, since it is larger than the sum of its proper divisors (8997369).

13121031 is a wasteful number, since it uses less digits than its factorization.

13121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 13121031 is about 3622.2963710884. The cubic root of 13121031 is about 235.8609194410.

Adding to 13121031 its reverse (13012131), we get a palindrome (26133162).

Subtracting from 13121031 its reverse (13012131), we obtain a square (108900 = 330²).

The spelling of 13121031 in words is "thirteen million, one hundred twenty-one thousand, thirty-one".