1216772471 has 4 divisors (see below), whose sum is σ = 1217220744. Its totient is φ = 1216324200.

The previous prime is 1216772441. The next prime is 1216772507. The reversal of 1216772471 is 1742776121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216772471 is a prime.

It is a super-3 number, since 3×1216772471³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216772441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220040 + ... + 225501.

It is an arithmetic number, because the mean of its divisors is an integer number (304305186).

Almost surely, 2^1216772471 is an apocalyptic number.

1216772471 is a deficient number, since it is larger than the sum of its proper divisors (448273).

1216772471 is an equidigital number, since it uses as much as digits as its factorization.

1216772471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448272.

The product of its digits is 32928, while the sum is 38.

The square root of 1216772471 is about 34882.2658524357. The cubic root of 1216772471 is about 1067.5866273142.

The spelling of 1216772471 in words is "one billion, two hundred sixteen million, seven hundred seventy-two thousand, four hundred seventy-one".