1216441503 has 64 divisors (see below), whose sum is σ = 1997107200. Its totient is φ = 728339040.

The previous prime is 1216441493. The next prime is 1216441517. The reversal of 1216441503 is 3051446121.

It is a happy number.

1216441503 is a `hidden beast` number, since 1 + 2 + 1 + 644 + 15 + 0 + 3 = 666.

It is not a de Polignac number, because 1216441503 - 2⁴ = 1216441487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216441543) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1545276 + ... + 1546062.

It is an arithmetic number, because the mean of its divisors is an integer number (31204800).

Almost surely, 2^1216441503 is an apocalyptic number.

1216441503 is a deficient number, since it is larger than the sum of its proper divisors (780665697).

1216441503 is a wasteful number, since it uses less digits than its factorization.

1216441503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969 (or 963 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1216441503 is about 34877.5214572366. The cubic root of 1216441503 is about 1067.4898222936.

Adding to 1216441503 its reverse (3051446121), we get a palindrome (4267887624).

The spelling of 1216441503 in words is "one billion, two hundred sixteen million, four hundred forty-one thousand, five hundred three".