1266631 has 2 divisors, whose sum is σ = 1266632. Its totient is φ = 1266630.

The previous prime is 1266611. The next prime is 1266677. The reversal of 1266631 is 1366621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266631 is a prime.

It is a super-2 number, since 2×1266631² = 3208708180322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1266596 and 1266605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633315 + 633316.

It is an arithmetic number, because the mean of its divisors is an integer number (633316).

2^1266631 is an apocalyptic number.

1266631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266631 is an equidigital number, since it uses as much as digits as its factorization.

1266631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 1266631 is about 1125.4470222983. The cubic root of 1266631 is about 108.1973699965.

The spelling of 1266631 in words is "one million, two hundred sixty-six thousand, six hundred thirty-one".