2115205031 has 4 divisors (see below), whose sum is σ = 2115979464. Its totient is φ = 2114430600.

The previous prime is 2115205021. The next prime is 2115205033. The reversal of 2115205031 is 1305025112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115205031 is a prime.

It is a super-2 number, since 2×2115205031² = 8948184646335421922, 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 = 2115204994 and 2115205012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115205033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383105 + ... + 388586.

It is an arithmetic number, because the mean of its divisors is an integer number (528994866).

Almost surely, 2^2115205031 is an apocalyptic number.

2115205031 is a deficient number, since it is larger than the sum of its proper divisors (774433).

2115205031 is an equidigital number, since it uses as much as digits as its factorization.

2115205031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774432.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2115205031 is about 45991.3582208658. The cubic root of 2115205031 is about 1283.6624094689.

The spelling of 2115205031 in words is "two billion, one hundred fifteen million, two hundred five thousand, thirty-one".