1641608257 has 8 divisors (see below), whose sum is σ = 1650606984. Its totient is φ = 1632626688.

The previous prime is 1641608251. The next prime is 1641608261. The reversal of 1641608257 is 7528061461.

It can be written as a sum of positive squares in 4 ways, for example, as 62001 + 1641546256 = 249^2 + 40516^2 .

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 1641608257 - 2²⁷ = 1507390529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641608251) 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, 218353 + ... + 225745.

It is an arithmetic number, because the mean of its divisors is an integer number (206325873).

Almost surely, 2^1641608257 is an apocalyptic number.

It is an amenable number.

1641608257 is a deficient number, since it is larger than the sum of its proper divisors (8998727).

1641608257 is an equidigital number, since it uses as much as digits as its factorization.

1641608257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8579.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 1641608257 is about 40516.7651349414. The cubic root of 1641608257 is about 1179.6590648189.

The spelling of 1641608257 in words is "one billion, six hundred forty-one million, six hundred eight thousand, two hundred fifty-seven".