1213600031 has 4 divisors (see below), whose sum is σ = 1386971472. Its totient is φ = 1040228592.

The previous prime is 1213600027. The next prime is 1213600067. The reversal of 1213600031 is 1300063121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1300063121 = 7 ⋅185723303.

It is a cyclic number.

It is not a de Polignac number, because 1213600031 - 2² = 1213600027 is a prime.

It is a super-2 number, since 2×1213600031² = 2945650070486401922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213599982 and 1213600009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213600001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86685710 + ... + 86685723.

It is an arithmetic number, because the mean of its divisors is an integer number (346742868).

Almost surely, 2^1213600031 is an apocalyptic number.

1213600031 is a deficient number, since it is larger than the sum of its proper divisors (173371441).

1213600031 is an equidigital number, since it uses as much as digits as its factorization.

1213600031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173371440.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1213600031 is about 34836.7626366171. The cubic root of 1213600031 is about 1066.6579951226.

Adding to 1213600031 its reverse (1300063121), we get a palindrome (2513663152).

The spelling of 1213600031 in words is "one billion, two hundred thirteen million, six hundred thousand, thirty-one".