1213645534 has 16 divisors (see below), whose sum is σ = 1886904720. Its totient is φ = 584758720.

The previous prime is 1213645523. The next prime is 1213645541. The reversal of 1213645534 is 4355463121.

It is a self number, because there is not a number n which added to its sum of digits gives 1213645534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10137 + ... + 50299.

It is an arithmetic number, because the mean of its divisors is an integer number (117931545).

Almost surely, 2^1213645534 is an apocalyptic number.

1213645534 is a deficient number, since it is larger than the sum of its proper divisors (673259186).

1213645534 is a wasteful number, since it uses less digits than its factorization.

1213645534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40715.

The product of its digits is 43200, while the sum is 34.

The square root of 1213645534 is about 34837.4157193096. The cubic root of 1213645534 is about 1066.6713261298.

The spelling of 1213645534 in words is "one billion, two hundred thirteen million, six hundred forty-five thousand, five hundred thirty-four".