1216120431 has 8 divisors (see below), whose sum is σ = 1623870720. Its totient is φ = 809558552.

The previous prime is 1216120379. The next prime is 1216120459. The reversal of 1216120431 is 1340216121.

1216120431 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 1216120431 - 2¹³ = 1216112239 is a prime.

It is a super-2 number, since 2×1216120431² = 2957897805391251522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1216120398 and 1216120407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216120471) 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, 294711 + ... + 298808.

It is an arithmetic number, because the mean of its divisors is an integer number (202983840).

Almost surely, 2^1216120431 is an apocalyptic number.

1216120431 is a deficient number, since it is larger than the sum of its proper divisors (407750289).

1216120431 is an equidigital number, since it uses as much as digits as its factorization.

1216120431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594205.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1216120431 is about 34872.9183034629. The cubic root of 1216120431 is about 1067.3958949790.

Adding to 1216120431 its reverse (1340216121), we get a palindrome (2556336552).

The spelling of 1216120431 in words is "one billion, two hundred sixteen million, one hundred twenty thousand, four hundred thirty-one".