1055121505 has 4 divisors (see below), whose sum is σ = 1266145812. Its totient is φ = 844097200.

The previous prime is 1055121491. The next prime is 1055121533. The reversal of 1055121505 is 5051215501.

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

It can be written as a sum of positive squares in 2 ways, for example, as 181387024 + 873734481 = 13468^2 + 29559^2 .

It is not a de Polignac number, because 1055121505 - 2⁹ = 1055120993 is a prime.

It is a super-2 number, since 2×1055121505² = 2226562780626930050, 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 1055121505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105512146 + ... + 105512155.

It is an arithmetic number, because the mean of its divisors is an integer number (316536453).

Almost surely, 2^1055121505 is an apocalyptic number.

It is an amenable number.

1055121505 is a deficient number, since it is larger than the sum of its proper divisors (211024307).

1055121505 is an equidigital number, since it uses as much as digits as its factorization.

1055121505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211024306.

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 1055121505 is about 32482.6338987466. The cubic root of 1055121505 is about 1018.0462102838.

The spelling of 1055121505 in words is "one billion, fifty-five million, one hundred twenty-one thousand, five hundred five".