1281432113 has 8 divisors (see below), whose sum is σ = 1383029928. Its totient is φ = 1180266624.

The previous prime is 1281432101. The next prime is 1281432133. The reversal of 1281432113 is 3112341821.

It can be written as a sum of positive squares in 4 ways, for example, as 442345024 + 839087089 = 21032^2 + 28967^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1281432113 - 2¹⁶ = 1281366577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281432133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101906 + ... + 113787.

It is an arithmetic number, because the mean of its divisors is an integer number (172878741).

Almost surely, 2^1281432113 is an apocalyptic number.

1281432113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1281432113 is a deficient number, since it is larger than the sum of its proper divisors (101597815).

1281432113 is a wasteful number, since it uses less digits than its factorization.

1281432113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216163.

The product of its digits is 1152, while the sum is 26.

The square root of 1281432113 is about 35797.0964325321. The cubic root of 1281432113 is about 1086.1718282925.

Adding to 1281432113 its reverse (3112341821), we get a palindrome (4393773934).

The spelling of 1281432113 in words is "one billion, two hundred eighty-one million, four hundred thirty-two thousand, one hundred thirteen".