1216511470 has 16 divisors (see below), whose sum is σ = 2201188608. Its totient is φ = 484056160.

The previous prime is 1216511453. The next prime is 1216511479. The reversal of 1216511470 is 741156121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216511479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316549 + ... + 320368.

It is an arithmetic number, because the mean of its divisors is an integer number (137574288).

Almost surely, 2^1216511470 is an apocalyptic number.

1216511470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216511470 is a deficient number, since it is larger than the sum of its proper divisors (984677138).

1216511470 is a wasteful number, since it uses less digits than its factorization.

1216511470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637115.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 1216511470 is about 34878.5244814055. The cubic root of 1216511470 is about 1067.5102884452.

Adding to 1216511470 its reverse (741156121), we get a palindrome (1957667591).

The spelling of 1216511470 in words is "one billion, two hundred sixteen million, five hundred eleven thousand, four hundred seventy".