1055121500 has 48 divisors (see below), whose sum is σ = 2383879680. Its totient is φ = 407489600.

The previous prime is 1055121491. The next prime is 1055121533. The reversal of 1055121500 is 51215501.

It is a happy number.

It is a super-2 number, since 2×1055121500² = 2226562759524500000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21884 + ... + 50883.

It is an arithmetic number, because the mean of its divisors is an integer number (49664160).

Almost surely, 2^1055121500 is an apocalyptic number.

1055121500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1055121500 is an abundant number, since it is smaller than the sum of its proper divisors (1328758180).

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

1055121500 is a wasteful number, since it uses less digits than its factorization.

1055121500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72815 (or 72803 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 1055121500 is about 32482.6338217824. The cubic root of 1055121500 is about 1018.0462086757.

The spelling of 1055121500 in words is "one billion, fifty-five million, one hundred twenty-one thousand, five hundred".