209150427 has 4 divisors (see below), whose sum is σ = 278867240. Its totient is φ = 139433616.

The previous prime is 209150419. The next prime is 209150437. The reversal of 209150427 is 724051902.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 209150427 - 2³ = 209150419 is a prime.

It is a super-2 number, since 2×209150427² = 87487802228564658, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209150394 and 209150403.

It is not an unprimeable number, because it can be changed into a prime (209150437) 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 3 ways as a sum of consecutive naturals, for example, 34858402 + ... + 34858407.

It is an arithmetic number, because the mean of its divisors is an integer number (69716810).

Almost surely, 2^209150427 is an apocalyptic number.

209150427 is a deficient number, since it is larger than the sum of its proper divisors (69716813).

209150427 is an equidigital number, since it uses as much as digits as its factorization.

209150427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69716812.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 209150427 is about 14462.0339855775. The cubic root of 209150427 is about 593.5895570627.

The spelling of 209150427 in words is "two hundred nine million, one hundred fifty thousand, four hundred twenty-seven".