1213553541 has 32 divisors (see below), whose sum is σ = 1733760000. Its totient is φ = 752830848.

The previous prime is 1213553507. The next prime is 1213553563. The reversal of 1213553541 is 1453553121.

It is not a de Polignac number, because 1213553541 - 2⁷ = 1213553413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1213553499 and 1213553508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213553441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 940825 + ... + 942113.

It is an arithmetic number, because the mean of its divisors is an integer number (54180000).

Almost surely, 2^1213553541 is an apocalyptic number.

It is an amenable number.

1213553541 is a deficient number, since it is larger than the sum of its proper divisors (520206459).

1213553541 is a wasteful number, since it uses less digits than its factorization.

1213553541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593.

The product of its digits is 9000, while the sum is 30.

The square root of 1213553541 is about 34836.0953753431. The cubic root of 1213553541 is about 1066.6443746101.

The spelling of 1213553541 in words is "one billion, two hundred thirteen million, five hundred fifty-three thousand, five hundred forty-one".