1203621827409 has 9 divisors (see below), whose sum is σ = 1738569615913. Its totient is φ = 802412357412.

The previous prime is 1203621827363. The next prime is 1203621827413. The reversal of 1203621827409 is 9047281263021.

The square root of 1203621827409 is 1097097.

It is a perfect power (a square), and thus also a powerful number.

1203621827409 is a `hidden beast` number, since 1 + 2 + 0 + 3 + 6 + 218 + 27 + 409 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1203621827409 - 2¹⁷ = 1203621696337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1203621827459) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3108442 + ... + 3474140.

Almost surely, 2^{1203621827409} is an apocalyptic number.

1203621827409 is the 1097097-th square number.

1203621827409 is the 548549-th centered octagonal number.

It is an amenable number.

1203621827409 is a deficient number, since it is larger than the sum of its proper divisors (534947788504).

1203621827409 is an frugal number, since it uses more digits than its factorization.

1203621827409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731404 (or 365702 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 1203621827409 in words is "one trillion, two hundred three billion, six hundred twenty-one million, eight hundred twenty-seven thousand, four hundred nine".