1216585507 has 2 divisors, whose sum is σ = 1216585508. Its totient is φ = 1216585506.

The previous prime is 1216585499. The next prime is 1216585511. The reversal of 1216585507 is 7055856121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7055856121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216585507 - 2³ = 1216585499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216585507.

It is not a weakly prime, because it can be changed into another prime (1216585547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608292753 + 608292754.

It is an arithmetic number, because the mean of its divisors is an integer number (608292754).

Almost surely, 2^1216585507 is an apocalyptic number.

1216585507 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216585507 is an equidigital number, since it uses as much as digits as its factorization.

1216585507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84000, while the sum is 40.

The square root of 1216585507 is about 34879.5858203620. The cubic root of 1216585507 is about 1067.5319442640.

The spelling of 1216585507 in words is "one billion, two hundred sixteen million, five hundred eighty-five thousand, five hundred seven".