1641660971 has 8 divisors (see below), whose sum is σ = 1787653200. Its totient is φ = 1501627680.

The previous prime is 1641660967. The next prime is 1641660997. The reversal of 1641660971 is 1790661461.

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 1641660971 - 2² = 1641660967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641660571) 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, 1489160 + ... + 1490261.

It is an arithmetic number, because the mean of its divisors is an integer number (223456650).

Almost surely, 2^1641660971 is an apocalyptic number.

1641660971 is a deficient number, since it is larger than the sum of its proper divisors (145992229).

1641660971 is a wasteful number, since it uses less digits than its factorization.

1641660971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2979469.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 1641660971 is about 40517.4156505570. The cubic root of 1641660971 is about 1179.6716914371.

The spelling of 1641660971 in words is "one billion, six hundred forty-one million, six hundred sixty thousand, nine hundred seventy-one".