1961181 has 6 divisors (see below), whose sum is σ = 2832830. Its totient is φ = 1307448.

The previous prime is 1961173. The next prime is 1961213. The reversal of 1961181 is 1811691.

It can be written as a sum of positive squares in only one way, i.e., 1265625 + 695556 = 1125^2 + 834^2 .

It is not a de Polignac number, because 1961181 - 2³ = 1961173 is a prime.

It is a super-2 number, since 2×1961181² = 7692461829522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961131) 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, 108946 + ... + 108963.

2^1961181 is an apocalyptic number.

It is an amenable number.

1961181 is a deficient number, since it is larger than the sum of its proper divisors (871649).

1961181 is a wasteful number, since it uses less digits than its factorization.

1961181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217915 (or 217912 counting only the distinct ones).

The product of its digits is 432, while the sum is 27.

The square root of 1961181 is about 1400.4217221966. The cubic root of 1961181 is about 125.1716255828.

The spelling of 1961181 in words is "one million, nine hundred sixty-one thousand, one hundred eighty-one".