1321731671 has 8 divisors (see below), whose sum is σ = 1425472944. Its totient is φ = 1218286080.

The previous prime is 1321731659. The next prime is 1321731683. The reversal of 1321731671 is 1761371231.

It is an interprime number because it is at equal distance from previous prime (1321731659) and next prime (1321731683).

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 1321731671 - 2¹⁰ = 1321730647 is a prime.

It is a super-2 number, since 2×1321731671² = 3493949220248904482, which contains 22 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 (1321731601) 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, 64586 + ... + 82551.

It is an arithmetic number, because the mean of its divisors is an integer number (178184118).

Almost surely, 2^1321731671 is an apocalyptic number.

1321731671 is a deficient number, since it is larger than the sum of its proper divisors (103741273).

1321731671 is a wasteful number, since it uses less digits than its factorization.

1321731671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147841.

The product of its digits is 5292, while the sum is 32.

The square root of 1321731671 is about 36355.6277761779. The cubic root of 1321731671 is about 1097.4407918066.

The spelling of 1321731671 in words is "one billion, three hundred twenty-one million, seven hundred thirty-one thousand, six hundred seventy-one".