1312213771 has 8 divisors (see below), whose sum is σ = 1432559088. Its totient is φ = 1192044000.

The previous prime is 1312213729. The next prime is 1312213781. The reversal of 1312213771 is 1773122131.

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 1312213771 - 2¹¹ = 1312211723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312213711) 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, 28000 + ... + 58381.

It is an arithmetic number, because the mean of its divisors is an integer number (179069886).

Almost surely, 2^1312213771 is an apocalyptic number.

1312213771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1312213771 is a deficient number, since it is larger than the sum of its proper divisors (120345317).

1312213771 is a wasteful number, since it uses less digits than its factorization.

1312213771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87773.

The product of its digits is 1764, while the sum is 28.

The square root of 1312213771 is about 36224.4913145789. The cubic root of 1312213771 is about 1094.8001890025.

The spelling of 1312213771 in words is "one billion, three hundred twelve million, two hundred thirteen thousand, seven hundred seventy-one".