11551787431 has 2 divisors, whose sum is σ = 11551787432. Its totient is φ = 11551787430.

The previous prime is 11551787381. The next prime is 11551787459. The reversal of 11551787431 is 13478715511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11551787431 - 2¹⁷ = 11551656359 is a prime.

It is a super-2 number, since 2×11551787431² (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 (11551787461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775893715 + 5775893716.

It is an arithmetic number, because the mean of its divisors is an integer number (5775893716).

Almost surely, 2^11551787431 is an apocalyptic number.

11551787431 is a deficient number, since it is larger than the sum of its proper divisors (1).

11551787431 is an equidigital number, since it uses as much as digits as its factorization.

11551787431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 43.

The spelling of 11551787431 in words is "eleven billion, five hundred fifty-one million, seven hundred eighty-seven thousand, four hundred thirty-one".