13950672781 has 2 divisors, whose sum is σ = 13950672782. Its totient is φ = 13950672780.

The previous prime is 13950672713. The next prime is 13950672809. The reversal of 13950672781 is 18727605931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11953923556 + 1996749225 = 109334^2 + 44685^2 .

It is a cyclic number.

It is not a de Polignac number, because 13950672781 - 2⁹ = 13950672269 is a prime.

It is a super-2 number, since 2×13950672781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13950672181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6975336390 + 6975336391.

It is an arithmetic number, because the mean of its divisors is an integer number (6975336391).

Almost surely, 2^13950672781 is an apocalyptic number.

It is an amenable number.

13950672781 is a deficient number, since it is larger than the sum of its proper divisors (1).

13950672781 is an equidigital number, since it uses as much as digits as its factorization.

13950672781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 13950672781 in words is "thirteen billion, nine hundred fifty million, six hundred seventy-two thousand, seven hundred eighty-one".