1231129 has 2 divisors, whose sum is σ = 1231130. Its totient is φ = 1231128.

The previous prime is 1231127. The next prime is 1231141. The reversal of 1231129 is 9211321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1054729 + 176400 = 1027^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231129 - 2¹ = 1231127 is a prime.

It is a super-2 number, since 2×1231129² = 3031357229282, which contains 22 as substring.

Together with 1231127, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1231127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615564 + 615565.

It is an arithmetic number, because the mean of its divisors is an integer number (615565).

2^1231129 is an apocalyptic number.

It is an amenable number.

1231129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231129 is an equidigital number, since it uses as much as digits as its factorization.

1231129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 19.

The square root of 1231129 is about 1109.5625264040. The cubic root of 1231129 is about 107.1768989819.

The spelling of 1231129 in words is "one million, two hundred thirty-one thousand, one hundred twenty-nine".