11431993 has 2 divisors, whose sum is σ = 11431994. Its totient is φ = 11431992.

The previous prime is 11431957. The next prime is 11432021. The reversal of 11431993 is 39913411.

11431993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11075584 + 356409 = 3328^2 + 597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11431993 is a prime.

It is not a weakly prime, because it can be changed into another prime (11431913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5715996 + 5715997.

It is an arithmetic number, because the mean of its divisors is an integer number (5715997).

Almost surely, 2^11431993 is an apocalyptic number.

It is an amenable number.

11431993 is a deficient number, since it is larger than the sum of its proper divisors (1).

11431993 is an equidigital number, since it uses as much as digits as its factorization.

11431993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 31.

The square root of 11431993 is about 3381.1230382818. The cubic root of 11431993 is about 225.2720528149.

It can be divided in two parts, 1143 and 1993, that added together give a square (3136 = 56²).

The spelling of 11431993 in words is "eleven million, four hundred thirty-one thousand, nine hundred ninety-three".