1772161 has 8 divisors (see below), whose sum is σ = 1869480. Its totient is φ = 1677312.

The previous prime is 1772119. The next prime is 1772167. The reversal of 1772161 is 1612771.

It can be written as a sum of positive squares in 4 ways, for example, as 690561 + 1081600 = 831^2 + 1040^2 .

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 1772161 - 2⁷ = 1772033 is a prime.

It is a Duffinian number.

1772161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1772167) 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, 961 + ... + 2113.

It is an arithmetic number, because the mean of its divisors is an integer number (233685).

2^1772161 is an apocalyptic number.

It is an amenable number.

1772161 is a deficient number, since it is larger than the sum of its proper divisors (97319).

1772161 is a wasteful number, since it uses less digits than its factorization.

1772161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235.

The product of its digits is 588, while the sum is 25.

The square root of 1772161 is about 1331.2253753591. The cubic root of 1772161 is about 121.0136587272.

The spelling of 1772161 in words is "one million, seven hundred seventy-two thousand, one hundred sixty-one".