2161155031 has 8 divisors (see below), whose sum is σ = 2510381984. Its totient is φ = 1822050720.

The previous prime is 2161155011. The next prime is 2161155041. The reversal of 2161155031 is 1305511612.

2161155031 = 12418² + 12419² + ... + 12431².

It is a happy number.

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

It is not a de Polignac number, because 2161155031 - 2⁹ = 2161154519 is a prime.

It is a super-2 number, since 2×2161155031² = 9341182136033221922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2161154987 and 2161155005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161155001) 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, 2530200 + ... + 2531053.

It is an arithmetic number, because the mean of its divisors is an integer number (313797748).

Almost surely, 2^2161155031 is an apocalyptic number.

2161155031 is a deficient number, since it is larger than the sum of its proper divisors (349226953).

2161155031 is an equidigital number, since it uses as much as digits as its factorization.

2161155031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5061321.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 2161155031 is about 46488.2246488291. The cubic root of 2161155031 is about 1292.8911839666.

Adding to 2161155031 its reverse (1305511612), we get a palindrome (3466666643).

The spelling of 2161155031 in words is "two billion, one hundred sixty-one million, one hundred fifty-five thousand, thirty-one".