1261271408 has 10 divisors (see below), whose sum is σ = 2443713384. Its totient is φ = 630635696.

The previous prime is 1261271383. The next prime is 1261271423. The reversal of 1261271408 is 8041721621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39414716 + ... + 39414747.

Almost surely, 2^1261271408 is an apocalyptic number.

It is an amenable number.

1261271408 is a deficient number, since it is larger than the sum of its proper divisors (1182441976).

1261271408 is an equidigital number, since it uses as much as digits as its factorization.

1261271408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78829471 (or 78829465 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 1261271408 is about 35514.3831144510. The cubic root of 1261271408 is about 1080.4454632413.

The spelling of 1261271408 in words is "one billion, two hundred sixty-one million, two hundred seventy-one thousand, four hundred eight".