1213261623 has 24 divisors (see below), whose sum is σ = 2004256800. Its totient is φ = 692803584.

The previous prime is 1213261613. The next prime is 1213261631. The reversal of 1213261623 is 3261623121.

1213261623 is a `hidden beast` number, since 1 + 2 + 1 + 32 + 6 + 1 + 623 = 666.

It is not a de Polignac number, because 1213261623 - 2⁸ = 1213261367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213261613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95383 + ... + 107351.

It is an arithmetic number, because the mean of its divisors is an integer number (83510700).

Almost surely, 2^1213261623 is an apocalyptic number.

1213261623 is a deficient number, since it is larger than the sum of its proper divisors (790995177).

1213261623 is a wasteful number, since it uses less digits than its factorization.

1213261623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13591 (or 13588 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1213261623 is about 34831.9052450480. The cubic root of 1213261623 is about 1066.5588413251.

Adding to 1213261623 its reverse (3261623121), we get a palindrome (4474884744).

The spelling of 1213261623 in words is "one billion, two hundred thirteen million, two hundred sixty-one thousand, six hundred twenty-three".