1261961696 has 24 divisors (see below), whose sum is σ = 2490123384. Its totient is φ = 629549440.

The previous prime is 1261961693. The next prime is 1261961707. The reversal of 1261961696 is 6961691621.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261961696.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261961693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30335 + ... + 58686.

It is an arithmetic number, because the mean of its divisors is an integer number (103755141).

Almost surely, 2^1261961696 is an apocalyptic number.

1261961696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1261961696 is a deficient number, since it is larger than the sum of its proper divisors (1228161688).

1261961696 is an equidigital number, since it uses as much as digits as its factorization.

1261961696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89474 (or 89466 counting only the distinct ones).

The product of its digits is 209952, while the sum is 47.

The square root of 1261961696 is about 35524.1002137985. The cubic root of 1261961696 is about 1080.6425348929.

The spelling of 1261961696 in words is "one billion, two hundred sixty-one million, nine hundred sixty-one thousand, six hundred ninety-six".