1221083131 has 2 divisors, whose sum is σ = 1221083132. Its totient is φ = 1221083130.

The previous prime is 1221083119. The next prime is 1221083159. The reversal of 1221083131 is 1313801221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221083131 - 2²⁹ = 684212219 is a prime.

It is a super-2 number, since 2×1221083131² = 2982088025625526322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221081131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610541565 + 610541566.

It is an arithmetic number, because the mean of its divisors is an integer number (610541566).

Almost surely, 2^1221083131 is an apocalyptic number.

1221083131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221083131 is an equidigital number, since it uses as much as digits as its factorization.

1221083131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1221083131 is about 34943.9999284570. Note that the first 4 decimals coincide. The cubic root of 1221083131 is about 1068.8458545583.

Adding to 1221083131 its reverse (1313801221), we get a palindrome (2534884352).

The spelling of 1221083131 in words is "one billion, two hundred twenty-one million, eighty-three thousand, one hundred thirty-one".