1281185272 has 8 divisors (see below), whose sum is σ = 2402222400. Its totient is φ = 640592632.

The previous prime is 1281185251. The next prime is 1281185293. The reversal of 1281185272 is 2725811821.

It is an interprime number because it is at equal distance from previous prime (1281185251) and next prime (1281185293).

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80074072 + ... + 80074087.

It is an arithmetic number, because the mean of its divisors is an integer number (300277800).

Almost surely, 2^1281185272 is an apocalyptic number.

It is an amenable number.

1281185272 is a deficient number, since it is larger than the sum of its proper divisors (1121037128).

1281185272 is a wasteful number, since it uses less digits than its factorization.

1281185272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160148165 (or 160148161 counting only the distinct ones).

The product of its digits is 17920, while the sum is 37.

The square root of 1281185272 is about 35793.6484868475. The cubic root of 1281185272 is about 1086.1020810790.

The spelling of 1281185272 in words is "one billion, two hundred eighty-one million, one hundred eighty-five thousand, two hundred seventy-two".