1311215450 has 24 divisors (see below), whose sum is σ = 2461663872. Its totient is φ = 519582320.

The previous prime is 1311215449. The next prime is 1311215459. The reversal of 1311215450 is 545121131.

It is not an unprimeable number, because it can be changed into a prime (1311215459) 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, 117194 + ... + 127893.

It is an arithmetic number, because the mean of its divisors is an integer number (102569328).

Almost surely, 2^1311215450 is an apocalyptic number.

1311215450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1311215450 is a deficient number, since it is larger than the sum of its proper divisors (1150448422).

1311215450 is a wasteful number, since it uses less digits than its factorization.

1311215450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245206 (or 245201 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1311215450 is about 36210.7090513290. The cubic root of 1311215450 is about 1094.5224803616.

Adding to 1311215450 its reverse (545121131), we get a palindrome (1856336581).

The spelling of 1311215450 in words is "one billion, three hundred eleven million, two hundred fifteen thousand, four hundred fifty".