156990361 has 12 divisors (see below), whose sum is σ = 172966500. Its totient is φ = 142382240.

The previous prime is 156990347. The next prime is 156990367. The reversal of 156990361 is 163099651.

It can be written as a sum of positive squares in 2 ways, for example, as 137241225 + 19749136 = 11715^2 + 4444^2 .

It is a de Polignac number, because none of the positive numbers 2^k-156990361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156990367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60315 + ... + 62863.

It is an arithmetic number, because the mean of its divisors is an integer number (14413875).

Almost surely, 2^156990361 is an apocalyptic number.

156990361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

156990361 is a deficient number, since it is larger than the sum of its proper divisors (15976139).

156990361 is a wasteful number, since it uses less digits than its factorization.

156990361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080 (or 3069 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 156990361 is about 12529.5794422638. The cubic root of 156990361 is about 539.4580307677.

The spelling of 156990361 in words is "one hundred fifty-six million, nine hundred ninety thousand, three hundred sixty-one".