1216953471 has 4 divisors (see below), whose sum is σ = 1622604632. Its totient is φ = 811302312.

The previous prime is 1216953407. The next prime is 1216953473. The reversal of 1216953471 is 1743596121.

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

It is not a de Polignac number, because 1216953471 - 2⁶ = 1216953407 is a prime.

It is a super-3 number, since 3×1216953471³ (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 (1216953473) 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, 202825576 + ... + 202825581.

It is an arithmetic number, because the mean of its divisors is an integer number (405651158).

Almost surely, 2^1216953471 is an apocalyptic number.

1216953471 is a deficient number, since it is larger than the sum of its proper divisors (405651161).

1216953471 is an equidigital number, since it uses as much as digits as its factorization.

1216953471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405651160.

The product of its digits is 45360, while the sum is 39.

The square root of 1216953471 is about 34884.8601975126. The cubic root of 1216953471 is about 1067.6395606833.

The spelling of 1216953471 in words is "one billion, two hundred sixteen million, nine hundred fifty-three thousand, four hundred seventy-one".