1231023511 has 2 divisors, whose sum is σ = 1231023512. Its totient is φ = 1231023510.

The previous prime is 1231023481. The next prime is 1231023553. The reversal of 1231023511 is 1153201321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231023511 - 2⁷ = 1231023383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231023571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615511755 + 615511756.

It is an arithmetic number, because the mean of its divisors is an integer number (615511756).

Almost surely, 2^1231023511 is an apocalyptic number.

1231023511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231023511 is an equidigital number, since it uses as much as digits as its factorization.

1231023511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1231023511 is about 35085.9446359935. The cubic root of 1231023511 is about 1071.7383775196.

Adding to 1231023511 its reverse (1153201321), we get a palindrome (2384224832).

The spelling of 1231023511 in words is "one billion, two hundred thirty-one million, twenty-three thousand, five hundred eleven".