1216751523 has 32 divisors (see below), whose sum is σ = 1853300736. Its totient is φ = 703431168.

The previous prime is 1216751491. The next prime is 1216751527. The reversal of 1216751523 is 3251576121.

It is not a de Polignac number, because 1216751523 - 2⁵ = 1216751491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216751527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 451486 + ... + 454172.

It is an arithmetic number, because the mean of its divisors is an integer number (57915648).

Almost surely, 2^1216751523 is an apocalyptic number.

1216751523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1216751523 is a deficient number, since it is larger than the sum of its proper divisors (636549213).

1216751523 is a wasteful number, since it uses less digits than its factorization.

1216751523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3403.

The product of its digits is 12600, while the sum is 33.

The square root of 1216751523 is about 34881.9655839518. The cubic root of 1216751523 is about 1067.5805007420.

The spelling of 1216751523 in words is "one billion, two hundred sixteen million, seven hundred fifty-one thousand, five hundred twenty-three".