1261963 has 2 divisors, whose sum is σ = 1261964. Its totient is φ = 1261962.

The previous prime is 1261943. The next prime is 1261969. The reversal of 1261963 is 3691621.

It is a strong prime.

It is an emirp because it is prime and its reverse (3691621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261963 is a prime.

It is a super-2 number, since 2×1261963² = 3185101226738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1261969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630981 + 630982.

It is an arithmetic number, because the mean of its divisors is an integer number (630982).

2^1261963 is an apocalyptic number.

1261963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261963 is an equidigital number, since it uses as much as digits as its factorization.

1261963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 1261963 is about 1123.3712654328. The cubic root of 1261963 is about 108.0642907106.

The spelling of 1261963 in words is "one million, two hundred sixty-one thousand, nine hundred sixty-three".