156540985 has 8 divisors (see below), whose sum is σ = 194326920. Its totient is φ = 120914304.

The previous prime is 156540971. The next prime is 156540997. The reversal of 156540985 is 589045651.

It can be written as a sum of positive squares in 4 ways, for example, as 190969 + 156350016 = 437^2 + 12504^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 156540985 - 2¹⁵ = 156508217 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539652 + ... + 539941.

It is an arithmetic number, because the mean of its divisors is an integer number (24290865).

Almost surely, 2^156540985 is an apocalyptic number.

It is an amenable number.

156540985 is a deficient number, since it is larger than the sum of its proper divisors (37785935).

156540985 is a wasteful number, since it uses less digits than its factorization.

156540985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079627.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 156540985 is about 12511.6339860148. The cubic root of 156540985 is about 538.9428161964.

The spelling of 156540985 in words is "one hundred fifty-six million, five hundred forty thousand, nine hundred eighty-five".