1216345534 has 32 divisors (see below), whose sum is σ = 1961625600. Its totient is φ = 563927040.

The previous prime is 1216345519. The next prime is 1216345549. The reversal of 1216345534 is 4355436121.

It is an interprime number because it is at equal distance from previous prime (1216345519) and next prime (1216345549).

It is a self number, because there is not a number n which added to its sum of digits gives 1216345534.

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, 575139 + ... + 577249.

It is an arithmetic number, because the mean of its divisors is an integer number (61300800).

Almost surely, 2^1216345534 is an apocalyptic number.

1216345534 is a deficient number, since it is larger than the sum of its proper divisors (745280066).

1216345534 is a wasteful number, since it uses less digits than its factorization.

1216345534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448.

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

The square root of 1216345534 is about 34876.1456299288. The cubic root of 1216345534 is about 1067.4617489818.

The spelling of 1216345534 in words is "one billion, two hundred sixteen million, three hundred forty-five thousand, five hundred thirty-four".