151681609 has 2 divisors, whose sum is σ = 151681610. Its totient is φ = 151681608.

The previous prime is 151681583. The next prime is 151681661. The reversal of 151681609 is 906186151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150921225 + 760384 = 12285^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 151681609 - 2⁹ = 151681097 is a prime.

It is not a weakly prime, because it can be changed into another prime (151681909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75840804 + 75840805.

It is an arithmetic number, because the mean of its divisors is an integer number (75840805).

Almost surely, 2^151681609 is an apocalyptic number.

It is an amenable number.

151681609 is a deficient number, since it is larger than the sum of its proper divisors (1).

151681609 is an equidigital number, since it uses as much as digits as its factorization.

151681609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 151681609 is about 12315.9087768626. The cubic root of 151681609 is about 533.3074398453.

The spelling of 151681609 in words is "one hundred fifty-one million, six hundred eighty-one thousand, six hundred nine".