1213553126 has 32 divisors (see below), whose sum is σ = 1969349760. Its totient is φ = 558791296.

The previous prime is 1213553101. The next prime is 1213553147. The reversal of 1213553126 is 6213553121.

It is a super-2 number, since 2×1213553126² = 2945422379248743752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299945 + ... + 303963.

It is an arithmetic number, because the mean of its divisors is an integer number (61542180).

Almost surely, 2^1213553126 is an apocalyptic number.

1213553126 is a deficient number, since it is larger than the sum of its proper divisors (755796634).

1213553126 is a wasteful number, since it uses less digits than its factorization.

1213553126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228.

The product of its digits is 5400, while the sum is 29.

The square root of 1213553126 is about 34836.0894188771. The cubic root of 1213553126 is about 1066.6442530230.

The spelling of 1213553126 in words is "one billion, two hundred thirteen million, five hundred fifty-three thousand, one hundred twenty-six".