1213561453 has 12 divisors (see below), whose sum is σ = 1319253588. Its totient is φ = 1115811840.

The previous prime is 1213561381. The next prime is 1213561477. The reversal of 1213561453 is 3541653121.

It can be written as a sum of positive squares in 6 ways, for example, as 5442889 + 1208118564 = 2333^2 + 34758^2 .

It is not a de Polignac number, because 1213561453 - 2¹⁷ = 1213430381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213561253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29463 + ... + 57403.

It is an arithmetic number, because the mean of its divisors is an integer number (109937799).

Almost surely, 2^1213561453 is an apocalyptic number.

1213561453 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1213561453 is a deficient number, since it is larger than the sum of its proper divisors (105692135).

1213561453 is a wasteful number, since it uses less digits than its factorization.

1213561453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28224 (or 28211 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 1213561453 is about 34836.2089355314. The cubic root of 1213561453 is about 1066.6466926707.

The spelling of 1213561453 in words is "one billion, two hundred thirteen million, five hundred sixty-one thousand, four hundred fifty-three".