1961161 has 8 divisors (see below), whose sum is σ = 2077920. Its totient is φ = 1845792.

The previous prime is 1961147. The next prime is 1961173. The reversal of 1961161 is 1611691.

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 1961161 - 2⁵ = 1961129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4206 + ... + 4648.

It is an arithmetic number, because the mean of its divisors is an integer number (259740).

2^1961161 is an apocalyptic number.

1961161 is the 886-th heptagonal number.

It is an amenable number.

1961161 is a deficient number, since it is larger than the sum of its proper divisors (116759).

1961161 is a wasteful number, since it uses less digits than its factorization.

1961161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695.

The product of its digits is 324, while the sum is 25.

The square root of 1961161 is about 1400.4145814722. The cubic root of 1961161 is about 125.1712000839.

The spelling of 1961161 in words is "one million, nine hundred sixty-one thousand, one hundred sixty-one".