1121539231 has 2 divisors, whose sum is σ = 1121539232. Its totient is φ = 1121539230.

The previous prime is 1121539207. The next prime is 1121539273. The reversal of 1121539231 is 1329351211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1121539231 - 2⁷ = 1121539103 is a prime.

It is a super-2 number, since 2×1121539231² = 2515700493344142722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1121539231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121539291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560769615 + 560769616.

It is an arithmetic number, because the mean of its divisors is an integer number (560769616).

Almost surely, 2^1121539231 is an apocalyptic number.

1121539231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121539231 is an equidigital number, since it uses as much as digits as its factorization.

1121539231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 28.

The square root of 1121539231 is about 33489.3898272274. The cubic root of 1121539231 is about 1038.9743435432.

The spelling of 1121539231 in words is "one billion, one hundred twenty-one million, five hundred thirty-nine thousand, two hundred thirty-one".