1555401133 has 24 divisors (see below), whose sum is σ = 1882270656. Its totient is φ = 1273334400.

The previous prime is 1555401061. The next prime is 1555401163. The reversal of 1555401133 is 3311045551.

It is not a de Polignac number, because 1555401133 - 2¹³ = 1555392941 is a prime.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555401163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66016 + ... + 86422.

It is an arithmetic number, because the mean of its divisors is an integer number (78427944).

Almost surely, 2^1555401133 is an apocalyptic number.

1555401133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1555401133 is a deficient number, since it is larger than the sum of its proper divisors (326869523).

1555401133 is a wasteful number, since it uses less digits than its factorization.

1555401133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20485 (or 20472 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 1555401133 is about 39438.5741755454. The cubic root of 1555401133 is about 1158.6372058183.

Adding to 1555401133 its reverse (3311045551), we get a palindrome (4866446684).

The spelling of 1555401133 in words is "one billion, five hundred fifty-five million, four hundred one thousand, one hundred thirty-three".