1281609231 has 8 divisors (see below), whose sum is σ = 1952928384. Its totient is φ = 732348120.

The previous prime is 1281609227. The next prime is 1281609319. The reversal of 1281609231 is 1329061821.

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

It is not a de Polignac number, because 1281609231 - 2² = 1281609227 is a prime.

It is a super-2 number, since 2×1281609231² = 3285044441968822722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1281609192 and 1281609201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281619231) 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, 30514485 + ... + 30514526.

It is an arithmetic number, because the mean of its divisors is an integer number (244116048).

Almost surely, 2^1281609231 is an apocalyptic number.

1281609231 is a deficient number, since it is larger than the sum of its proper divisors (671319153).

1281609231 is an equidigital number, since it uses as much as digits as its factorization.

1281609231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61029021.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1281609231 is about 35799.5702627839. The cubic root of 1281609231 is about 1086.2218691068.

The spelling of 1281609231 in words is "one billion, two hundred eighty-one million, six hundred nine thousand, two hundred thirty-one".