1213513631 has 8 divisors (see below), whose sum is σ = 1366537728. Its totient is φ = 1067607000.

The previous prime is 1213513627. The next prime is 1213513661. The reversal of 1213513631 is 1363153121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213513631 - 2² = 1213513627 is a prime.

It is a super-2 number, since 2×1213513631² = 2945230665245608322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213513631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213513661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1779005 + ... + 1779686.

It is an arithmetic number, because the mean of its divisors is an integer number (170817216).

Almost surely, 2^1213513631 is an apocalyptic number.

1213513631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1213513631 is a deficient number, since it is larger than the sum of its proper divisors (153024097).

1213513631 is a wasteful number, since it uses less digits than its factorization.

1213513631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558733.

The product of its digits is 1620, while the sum is 26.

The square root of 1213513631 is about 34835.5225452411. The cubic root of 1213513631 is about 1066.6326816104.

Adding to 1213513631 its reverse (1363153121), we get a palindrome (2576666752).

The spelling of 1213513631 in words is "one billion, two hundred thirteen million, five hundred thirteen thousand, six hundred thirty-one".