971727643 has 6 divisors (see below), whose sum is σ = 1004085852. Its totient is φ = 940380660.

The previous prime is 971727637. The next prime is 971727649. The reversal of 971727643 is 346727179.

It is an interprime number because it is at equal distance from previous prime (971727637) and next prime (971727649).

It is not a de Polignac number, because 971727643 - 2⁵ = 971727611 is a prime.

It is a super-2 number, since 2×971727643² = 1888509224340670898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 971727593 and 971727602.

It is not an unprimeable number, because it can be changed into a prime (971727649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 504621 + ... + 506542.

It is an arithmetic number, because the mean of its divisors is an integer number (167347642).

Almost surely, 2^971727643 is an apocalyptic number.

971727643 is a deficient number, since it is larger than the sum of its proper divisors (32358209).

971727643 is a wasteful number, since it uses less digits than its factorization.

971727643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011225 (or 1011194 counting only the distinct ones).

The product of its digits is 444528, while the sum is 46.

The square root of 971727643 is about 31172.5463027966. The cubic root of 971727643 is about 990.4856451408.

The spelling of 971727643 in words is "nine hundred seventy-one million, seven hundred twenty-seven thousand, six hundred forty-three".