1266421831 has 2 divisors, whose sum is σ = 1266421832. Its totient is φ = 1266421830.

The previous prime is 1266421823. The next prime is 1266421847. The reversal of 1266421831 is 1381246621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1266421831 - 2³ = 1266421823 is a prime.

It is a super-2 number, since 2×1266421831² = 3207648508066785122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266421811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633210915 + 633210916.

It is an arithmetic number, because the mean of its divisors is an integer number (633210916).

Almost surely, 2^1266421831 is an apocalyptic number.

1266421831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266421831 is an equidigital number, since it uses as much as digits as its factorization.

1266421831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 1266421831 is about 35586.8210297014. The cubic root of 1266421831 is about 1081.9141383367.

The spelling of 1266421831 in words is "one billion, two hundred sixty-six million, four hundred twenty-one thousand, eight hundred thirty-one".