2115532431 has 8 divisors (see below), whose sum is σ = 3134122160. Its totient is φ = 1410354936.

The previous prime is 2115532429. The next prime is 2115532439. The reversal of 2115532431 is 1342355112.

It is not a de Polignac number, because 2115532431 - 2¹ = 2115532429 is a prime.

It is a super-2 number, since 2×2115532431² = 8950954933225539522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 78353053 = 2115532431 / (2 + 1 + 1 + 5 + 5 + 3 + 2 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2115532395 and 2115532404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115532439) 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, 39176500 + ... + 39176553.

It is an arithmetic number, because the mean of its divisors is an integer number (391765270).

Almost surely, 2^2115532431 is an apocalyptic number.

2115532431 is a deficient number, since it is larger than the sum of its proper divisors (1018589729).

2115532431 is an equidigital number, since it uses as much as digits as its factorization.

2115532431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78353062 (or 78353056 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 2115532431 is about 45994.9174474746. The cubic root of 2115532431 is about 1283.7286362074.

Adding to 2115532431 its reverse (1342355112), we get a palindrome (3457887543).

The spelling of 2115532431 in words is "two billion, one hundred fifteen million, five hundred thirty-two thousand, four hundred thirty-one".