1216857053 has 2 divisors, whose sum is σ = 1216857054. Its totient is φ = 1216857052.

The previous prime is 1216857049. The next prime is 1216857091. The reversal of 1216857053 is 3507586121.

It is an a-pointer prime, because the next prime (1216857091) can be obtained adding 1216857053 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1215080164 + 1776889 = 34858^2 + 1333^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216857053 - 2² = 1216857049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216856998 and 1216857016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216850053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608428526 + 608428527.

It is an arithmetic number, because the mean of its divisors is an integer number (608428527).

Almost surely, 2^1216857053 is an apocalyptic number.

It is an amenable number.

1216857053 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216857053 is an equidigital number, since it uses as much as digits as its factorization.

1216857053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 1216857053 is about 34883.4782239386. The cubic root of 1216857053 is about 1067.6113639356.

The spelling of 1216857053 in words is "one billion, two hundred sixteen million, eight hundred fifty-seven thousand, fifty-three".