151808561 has 8 divisors (see below), whose sum is σ = 153452544. Its totient is φ = 150171840.

The previous prime is 151808557. The next prime is 151808563. The reversal of 151808561 is 165808151.

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 151808561 - 2² = 151808557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151808563) by changing a digit.

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, 47081 + ... + 50201.

It is an arithmetic number, because the mean of its divisors is an integer number (19181568).

Almost surely, 2^151808561 is an apocalyptic number.

It is an amenable number.

151808561 is a deficient number, since it is larger than the sum of its proper divisors (1643983).

151808561 is a wasteful number, since it uses less digits than its factorization.

151808561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631.

The product of its (nonzero) digits is 9600, while the sum is 35.

The square root of 151808561 is about 12321.0616831505. The cubic root of 151808561 is about 533.4561846769.

The spelling of 151808561 in words is "one hundred fifty-one million, eight hundred eight thousand, five hundred sixty-one".