1156643213 has 8 divisors (see below), whose sum is σ = 1274286816. Its totient is φ = 1041082000.

The previous prime is 1156643209. The next prime is 1156643219. The reversal of 1156643213 is 3123466511.

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 1156643213 - 2² = 1156643209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1156643213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156643219) 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, 519431 + ... + 521652.

It is an arithmetic number, because the mean of its divisors is an integer number (159285852).

Almost surely, 2^1156643213 is an apocalyptic number.

It is an amenable number.

1156643213 is a deficient number, since it is larger than the sum of its proper divisors (117643603).

1156643213 is a wasteful number, since it uses less digits than its factorization.

1156643213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041195.

The product of its digits is 12960, while the sum is 32.

The square root of 1156643213 is about 34009.4576992930. The cubic root of 1156643213 is about 1049.7030794608.

The spelling of 1156643213 in words is "one billion, one hundred fifty-six million, six hundred forty-three thousand, two hundred thirteen".