215540154 has 12 divisors (see below), whose sum is σ = 467003706. Its totient is φ = 71846712.

The previous prime is 215540069. The next prime is 215540159. The reversal of 215540154 is 451045512.

It can be written as a sum of positive squares in only one way, i.e., 191185929 + 24354225 = 13827^2 + 4935^2 .

It is a super-3 number, since 3×215540154³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (215540159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5987209 + ... + 5987244.

Almost surely, 2^215540154 is an apocalyptic number.

215540154 is an abundant number, since it is smaller than the sum of its proper divisors (251463552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215540154 is a wasteful number, since it uses less digits than its factorization.

215540154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11974461 (or 11974458 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 215540154 is about 14681.2858428681. The cubic root of 215540154 is about 599.5739141564.

Adding to 215540154 its reverse (451045512), we get a palindrome (666585666).

The spelling of 215540154 in words is "two hundred fifteen million, five hundred forty thousand, one hundred fifty-four".