1000228521601 has 4 divisors (see below), whose sum is σ = 1002456202500. Its totient is φ = 998000840704.

The previous prime is 1000228521583. The next prime is 1000228521667. The reversal of 1000228521601 is 1061258220001.

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 248027904576 + 752200617025 = 498024^2 + 867295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000228521601 - 2⁷ = 1000228521473 is a prime.

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 1000228521601.

It is not an unprimeable number, because it can be changed into a prime (1000228521701) 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, 1113839776 + ... + 1113840673.

It is an arithmetic number, because the mean of its divisors is an integer number (250614050625).

Almost surely, 2^{1000228521601} is an apocalyptic number.

It is an amenable number.

1000228521601 is a deficient number, since it is larger than the sum of its proper divisors (2227680899).

1000228521601 is an equidigital number, since it uses as much as digits as its factorization.

1000228521601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227680898.

The product of its (nonzero) digits is 1920, while the sum is 28.

The spelling of 1000228521601 in words is "one trillion, two hundred twenty-eight million, five hundred twenty-one thousand, six hundred one".