1555040231 has 4 divisors (see below), whose sum is σ = 1560574464. Its totient is φ = 1549506000.

The previous prime is 1555040219. The next prime is 1555040257. The reversal of 1555040231 is 1320405551.

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 1555040231 - 2¹⁸ = 1554778087 is a prime.

It is a super-2 number, since 2×1555040231² = 4836300240057066722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1555040231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555042231) 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, 2766695 + ... + 2767256.

It is an arithmetic number, because the mean of its divisors is an integer number (390143616).

Almost surely, 2^1555040231 is an apocalyptic number.

1555040231 is a deficient number, since it is larger than the sum of its proper divisors (5534233).

1555040231 is an equidigital number, since it uses as much as digits as its factorization.

1555040231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5534232.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 1555040231 is about 39433.9984150733. The cubic root of 1555040231 is about 1158.5475854578.

Adding to 1555040231 its reverse (1320405551), we get a palindrome (2875445782).

The spelling of 1555040231 in words is "one billion, five hundred fifty-five million, forty thousand, two hundred thirty-one".