1213664450 has 24 divisors (see below), whose sum is σ = 2279342208. Its totient is φ = 480750480.

The previous prime is 1213664447. The next prime is 1213664453. The reversal of 1213664450 is 544663121.

It is an interprime number because it is at equal distance from previous prime (1213664447) and next prime (1213664453).

It is not an unprimeable number, because it can be changed into a prime (1213664453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112682 + ... + 122981.

It is an arithmetic number, because the mean of its divisors is an integer number (94972592).

Almost surely, 2^1213664450 is an apocalyptic number.

1213664450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1213664450 is a deficient number, since it is larger than the sum of its proper divisors (1065677758).

1213664450 is a wasteful number, since it uses less digits than its factorization.

1213664450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235778 (or 235773 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1213664450 is about 34837.6872079649. The cubic root of 1213664450 is about 1066.6768678495.

The spelling of 1213664450 in words is "one billion, two hundred thirteen million, six hundred sixty-four thousand, four hundred fifty".