1216001522 has 16 divisors (see below), whose sum is σ = 1899692352. Its totient is φ = 583233840.

The previous prime is 1216001491. The next prime is 1216001537. The reversal of 1216001522 is 2251006121.

It is a junction number, because it is equal to n+sod(n) for n = 1216001494 and 1216001503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110468 + ... + 120975.

It is an arithmetic number, because the mean of its divisors is an integer number (118730772).

Almost surely, 2^1216001522 is an apocalyptic number.

1216001522 is a deficient number, since it is larger than the sum of its proper divisors (683690830).

1216001522 is a wasteful number, since it uses less digits than its factorization.

1216001522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231553.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1216001522 is about 34871.2133714902. The cubic root of 1216001522 is about 1067.3611048074.

Adding to 1216001522 its reverse (2251006121), we get a palindrome (3467007643).

The spelling of 1216001522 in words is "one billion, two hundred sixteen million, one thousand, five hundred twenty-two".