13780831 has 2 divisors, whose sum is σ = 13780832. Its totient is φ = 13780830.

The previous prime is 13780817. The next prime is 13780843. The reversal of 13780831 is 13808731.

It is a strong prime.

It is an emirp because it is prime and its reverse (13808731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13780831 - 2⁵ = 13780799 is a prime.

It is a super-2 number, since 2×13780831² = 379822606101122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13780793 and 13780802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13780231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6890415 + 6890416.

It is an arithmetic number, because the mean of its divisors is an integer number (6890416).

Almost surely, 2^13780831 is an apocalyptic number.

13780831 is a deficient number, since it is larger than the sum of its proper divisors (1).

13780831 is an equidigital number, since it uses as much as digits as its factorization.

13780831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 13780831 is about 3712.2541669449. The cubic root of 13780831 is about 239.7499189030.

The spelling of 13780831 in words is "thirteen million, seven hundred eighty thousand, eight hundred thirty-one".