2391961 has 16 divisors (see below), whose sum is σ = 2882880. Its totient is φ = 1955520.

The previous prime is 2391953. The next prime is 2391973. The reversal of 2391961 is 1691932.

It is a cyclic number.

It is not a de Polignac number, because 2391961 - 2³ = 2391953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2391461) 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 15 ways as a sum of consecutive naturals, for example, 5955 + ... + 6343.

It is an arithmetic number, because the mean of its divisors is an integer number (180180).

2^2391961 is an apocalyptic number.

It is an amenable number.

2391961 is a deficient number, since it is larger than the sum of its proper divisors (490919).

2391961 is a wasteful number, since it uses less digits than its factorization.

2391961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456.

The product of its digits is 2916, while the sum is 31.

The square root of 2391961 is about 1546.5965860560. The cubic root of 2391961 is about 133.7369347007.

The spelling of 2391961 in words is "two million, three hundred ninety-one thousand, nine hundred sixty-one".