2161207837 has 8 divisors (see below), whose sum is σ = 2192762880. Its totient is φ = 2129683920.

The previous prime is 2161207831. The next prime is 2161207843. The reversal of 2161207837 is 7387021612.

It is an interprime number because it is at equal distance from previous prime (2161207831) and next prime (2161207843).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161207837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2161207796 and 2161207805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161207831) 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, 157348 + ... + 170530.

It is an arithmetic number, because the mean of its divisors is an integer number (274095360).

Almost surely, 2^2161207837 is an apocalyptic number.

It is an amenable number.

2161207837 is a deficient number, since it is larger than the sum of its proper divisors (31555043).

2161207837 is a wasteful number, since it uses less digits than its factorization.

2161207837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15563.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 2161207837 is about 46488.7925956353. The cubic root of 2161207837 is about 1292.9017141160.

The spelling of 2161207837 in words is "two billion, one hundred sixty-one million, two hundred seven thousand, eight hundred thirty-seven".