1555351240231 has 4 divisors (see below), whose sum is σ = 1558544980432. Its totient is φ = 1552157500032.

The previous prime is 1555351240217. The next prime is 1555351240271. The reversal of 1555351240231 is 1320421535551.

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

It is a cyclic number.

It is not a de Polignac number, because 1555351240231 - 2⁵ = 1555351240199 is a prime.

It is a super-2 number, since 2×1555351240231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555351240211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1596869370 + ... + 1596870343.

It is an arithmetic number, because the mean of its divisors is an integer number (389636245108).

Almost surely, 2^{1555351240231} is an apocalyptic number.

1555351240231 is a deficient number, since it is larger than the sum of its proper divisors (3193740201).

1555351240231 is an equidigital number, since it uses as much as digits as its factorization.

1555351240231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3193740200.

The product of its (nonzero) digits is 90000, while the sum is 37.

Adding to 1555351240231 its reverse (1320421535551), we get a palindrome (2875772775782).

The spelling of 1555351240231 in words is "one trillion, five hundred fifty-five billion, three hundred fifty-one million, two hundred forty thousand, two hundred thirty-one".