1641157 has 6 divisors (see below), whose sum is σ = 1909158. Its totient is φ = 1406664.

The previous prime is 1641137. The next prime is 1641161. The reversal of 1641157 is 7511461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1640961 + 196 = 1281^2 + 14^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1641157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641137) 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, 16698 + ... + 16795.

It is an arithmetic number, because the mean of its divisors is an integer number (318193).

2^1641157 is an apocalyptic number.

It is an amenable number.

1641157 is a deficient number, since it is larger than the sum of its proper divisors (268001).

1641157 is an equidigital number, since it uses as much as digits as its factorization.

1641157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33507 (or 33500 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 1641157 is about 1281.0765004480. The cubic root of 1641157 is about 117.9550963877.

The spelling of 1641157 in words is "one million, six hundred forty-one thousand, one hundred fifty-seven".