1276217231 has 4 divisors (see below), whose sum is σ = 1281070032. Its totient is φ = 1271364432.

The previous prime is 1276217221. The next prime is 1276217237. The reversal of 1276217231 is 1327126721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1327126721 = 3259 ⋅407219.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1276217231 is a prime.

It is a super-2 number, since 2×1276217231² = 3257460841402614722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276217237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2426006 + ... + 2426531.

It is an arithmetic number, because the mean of its divisors is an integer number (320267508).

Almost surely, 2^1276217231 is an apocalyptic number.

1276217231 is a deficient number, since it is larger than the sum of its proper divisors (4852801).

1276217231 is an equidigital number, since it uses as much as digits as its factorization.

1276217231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4852800.

The product of its digits is 7056, while the sum is 32.

The square root of 1276217231 is about 35724.1827198328. The cubic root of 1276217231 is about 1084.6964063844.

The spelling of 1276217231 in words is "one billion, two hundred seventy-six million, two hundred seventeen thousand, two hundred thirty-one".