1231043240355 has 8 divisors (see below), whose sum is σ = 1969669184592. Its totient is φ = 656556394848.

The previous prime is 1231043240221. The next prime is 1231043240387. The reversal of 1231043240355 is 5530423401321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231043240355 - 2²² = 1231039046051 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41034774664 + ... + 41034774693.

It is an arithmetic number, because the mean of its divisors is an integer number (246208648074).

Almost surely, 2^{1231043240355} is an apocalyptic number.

1231043240355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1231043240355 is a deficient number, since it is larger than the sum of its proper divisors (738625944237).

1231043240355 is an equidigital number, since it uses as much as digits as its factorization.

1231043240355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82069549365.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 1231043240355 its reverse (5530423401321), we get a palindrome (6761466641676).

The spelling of 1231043240355 in words is "one trillion, two hundred thirty-one billion, forty-three million, two hundred forty thousand, three hundred fifty-five".