1281478275 has 288 divisors, whose sum is σ = 3203366400. Its totient is φ = 472780800.

The previous prime is 1281478273. The next prime is 1281478277. The reversal of 1281478275 is 5728741821.

It is an interprime number because it is at equal distance from previous prime (1281478273) and next prime (1281478277).

It is not a de Polignac number, because 1281478275 - 2¹ = 1281478273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1281478275.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281478271) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 5595861 + ... + 5596089.

It is an arithmetic number, because the mean of its divisors is an integer number (11122800).

Almost surely, 2^1281478275 is an apocalyptic number.

1281478275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1281478275 is an abundant number, since it is smaller than the sum of its proper divisors (1921888125).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281478275 is a wasteful number, since it uses less digits than its factorization.

1281478275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 291 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 1281478275 is about 35797.7411996902. The cubic root of 1281478275 is about 1086.1848707995.

The spelling of 1281478275 in words is "one billion, two hundred eighty-one million, four hundred seventy-eight thousand, two hundred seventy-five".