1213612745 has 16 divisors (see below), whose sum is σ = 1623162240. Its totient is φ = 865684224.

The previous prime is 1213612679. The next prime is 1213612759. The reversal of 1213612745 is 5472163121.

It is a cyclic number.

It is not a de Polignac number, because 1213612745 - 2⁸ = 1213612489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374117 + ... + 377346.

It is an arithmetic number, because the mean of its divisors is an integer number (101447640).

Almost surely, 2^1213612745 is an apocalyptic number.

It is an amenable number.

1213612745 is a deficient number, since it is larger than the sum of its proper divisors (409549495).

1213612745 is a wasteful number, since it uses less digits than its factorization.

1213612745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751504.

The product of its digits is 10080, while the sum is 32.

The square root of 1213612745 is about 34836.9451157819. The cubic root of 1213612745 is about 1066.6617199749.

Adding to 1213612745 its reverse (5472163121), we get a palindrome (6685775866).

The spelling of 1213612745 in words is "one billion, two hundred thirteen million, six hundred twelve thousand, seven hundred forty-five".