1271145550 has 96 divisors (see below), whose sum is σ = 2519838720. Its totient is φ = 476486400.

The previous prime is 1271145479. The next prime is 1271145571. The reversal of 1271145550 is 555411721.

It is a super-2 number, since 2×1271145550² = 3231622018569605000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7611567 + ... + 7611733.

It is an arithmetic number, because the mean of its divisors is an integer number (26248320).

Almost surely, 2^1271145550 is an apocalyptic number.

1271145550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1271145550 is a deficient number, since it is larger than the sum of its proper divisors (1248693170).

1271145550 is a wasteful number, since it uses less digits than its factorization.

1271145550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 1271145550 is about 35653.1281937504. The cubic root of 1271145550 is about 1083.2576394187.

The spelling of 1271145550 in words is "one billion, two hundred seventy-one million, one hundred forty-five thousand, five hundred fifty".