1555451140 has 24 divisors (see below), whose sum is σ = 3354731352. Its totient is φ = 605364480.

The previous prime is 1555451137. The next prime is 1555451143. The reversal of 1555451140 is 411545551.

It is an interprime number because it is at equal distance from previous prime (1555451137) and next prime (1555451143).

It can be written as a sum of positive squares in 4 ways, for example, as 130690624 + 1424760516 = 11432^2 + 37746^2 .

It is not an unprimeable number, because it can be changed into a prime (1555451143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1050241 + ... + 1051720.

It is an arithmetic number, because the mean of its divisors is an integer number (139780473).

Almost surely, 2^1555451140 is an apocalyptic number.

1555451140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555451140 is an abundant number, since it is smaller than the sum of its proper divisors (1799280212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555451140 is a wasteful number, since it uses less digits than its factorization.

1555451140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102007 (or 2102005 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 31.

The square root of 1555451140 is about 39439.2081563512. The cubic root of 1555451140 is about 1158.6496226259.

Adding to 1555451140 its reverse (411545551), we get a palindrome (1966996691).

The spelling of 1555451140 in words is "one billion, five hundred fifty-five million, four hundred fifty-one thousand, one hundred forty".