215440431151 has 12 divisors (see below), whose sum is σ = 236818071000. Its totient is φ = 195845305040.

The previous prime is 215440431109. The next prime is 215440431221. The reversal of 215440431151 is 151134044512.

It is not a de Polignac number, because 215440431151 - 2⁷ = 215440431023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215440431251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3856245 + ... + 3911713.

It is an arithmetic number, because the mean of its divisors is an integer number (19734839250).

Almost surely, 2^215440431151 is an apocalyptic number.

215440431151 is a deficient number, since it is larger than the sum of its proper divisors (21377639849).

215440431151 is a wasteful number, since it uses less digits than its factorization.

215440431151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87590 (or 87579 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 215440431151 its reverse (151134044512), we get a palindrome (366574475663).

The spelling of 215440431151 in words is "two hundred fifteen billion, four hundred forty million, four hundred thirty-one thousand, one hundred fifty-one".