1216373431 has 8 divisors (see below), whose sum is σ = 1497075104. Its totient is φ = 962405280.

The previous prime is 1216373399. The next prime is 1216373447. The reversal of 1216373431 is 1343736121.

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 1216373431 - 2⁵ = 1216373399 is a prime.

It is a super-2 number, since 2×1216373431² = 2959128647285423522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1216373393 and 1216373402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216373831) 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, 6683280 + ... + 6683461.

It is an arithmetic number, because the mean of its divisors is an integer number (187134388).

Almost surely, 2^1216373431 is an apocalyptic number.

1216373431 is a deficient number, since it is larger than the sum of its proper divisors (280701673).

1216373431 is a wasteful number, since it uses less digits than its factorization.

1216373431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13366761.

The product of its digits is 9072, while the sum is 31.

The square root of 1216373431 is about 34876.5455714869. The cubic root of 1216373431 is about 1067.4699096982.

The spelling of 1216373431 in words is "one billion, two hundred sixteen million, three hundred seventy-three thousand, four hundred thirty-one".