151640809 has 4 divisors (see below), whose sum is σ = 156532480. Its totient is φ = 146749140.

The previous prime is 151640773. The next prime is 151640813. The reversal of 151640809 is 908046151.

151640809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908046151 = 1847 ⋅491633.

It is a cyclic number.

It is not a de Polignac number, because 151640809 - 2¹¹ = 151638761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151640009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2445789 + ... + 2445850.

It is an arithmetic number, because the mean of its divisors is an integer number (39133120).

Almost surely, 2^151640809 is an apocalyptic number.

It is an amenable number.

151640809 is a deficient number, since it is larger than the sum of its proper divisors (4891671).

151640809 is an equidigital number, since it uses as much as digits as its factorization.

151640809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4891670.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 151640809 is about 12314.2522712506. The cubic root of 151640809 is about 533.2596184144.

The spelling of 151640809 in words is "one hundred fifty-one million, six hundred forty thousand, eight hundred nine".