1216255450 has 24 divisors (see below), whose sum is σ = 2276658972. Its totient is φ = 483400320.

The previous prime is 1216255427. The next prime is 1216255451. The reversal of 1216255450 is 545526121.

It can be written as a sum of positive squares in 6 ways, for example, as 58690921 + 1157564529 = 7661^2 + 34023^2 .

It is not an unprimeable number, because it can be changed into a prime (1216255451) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 69619 + ... + 85318.

Almost surely, 2^1216255450 is an apocalyptic number.

1216255450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216255450 is a deficient number, since it is larger than the sum of its proper divisors (1060403522).

1216255450 is a wasteful number, since it uses less digits than its factorization.

1216255450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155106 (or 155101 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 1216255450 is about 34874.8541215587. The cubic root of 1216255450 is about 1067.4353958347.

The spelling of 1216255450 in words is "one billion, two hundred sixteen million, two hundred fifty-five thousand, four hundred fifty".