1281975476 has 6 divisors (see below), whose sum is σ = 2243457090. Its totient is φ = 640987736.

The previous prime is 1281975473. The next prime is 1281975523. The reversal of 1281975476 is 6745791821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 650760100 + 631215376 = 25510^2 + 25124^2 .

It is a super-2 number, since 2×1281975476² = 3286922242130853152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281975473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160246931 + ... + 160246938.

It is an arithmetic number, because the mean of its divisors is an integer number (373909515).

Almost surely, 2^1281975476 is an apocalyptic number.

It is an amenable number.

1281975476 is a deficient number, since it is larger than the sum of its proper divisors (961481614).

1281975476 is a wasteful number, since it uses less digits than its factorization.

1281975476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320493873 (or 320493871 counting only the distinct ones).

The product of its digits is 846720, while the sum is 50.

The square root of 1281975476 is about 35804.6851124263. The cubic root of 1281975476 is about 1086.3253289939.

The spelling of 1281975476 in words is "one billion, two hundred eighty-one million, nine hundred seventy-five thousand, four hundred seventy-six".