1231033353511 has 4 divisors (see below), whose sum is σ = 1325728226872. Its totient is φ = 1136338480152.

The previous prime is 1231033353497. The next prime is 1231033353523. The reversal of 1231033353511 is 1153533301321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231033353511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231033353311) 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, 47347436661 + ... + 47347436686.

It is an arithmetic number, because the mean of its divisors is an integer number (331432056718).

Almost surely, 2^{1231033353511} is an apocalyptic number.

1231033353511 is a deficient number, since it is larger than the sum of its proper divisors (94694873361).

1231033353511 is an equidigital number, since it uses as much as digits as its factorization.

1231033353511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94694873360.

The product of its (nonzero) digits is 12150, while the sum is 31.

Adding to 1231033353511 its reverse (1153533301321), we get a palindrome (2384566654832).

The spelling of 1231033353511 in words is "one trillion, two hundred thirty-one billion, thirty-three million, three hundred fifty-three thousand, five hundred eleven".