1581686151 has 16 divisors (see below), whose sum is σ = 2168033280. Its totient is φ = 1025081280.

The previous prime is 1581686147. The next prime is 1581686167. The reversal of 1581686151 is 1516861851.

It is not a de Polignac number, because 1581686151 - 2² = 1581686147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581686111) 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 15 ways as a sum of consecutive naturals, for example, 12090 + ... + 57528.

It is an arithmetic number, because the mean of its divisors is an integer number (135502080).

Almost surely, 2^1581686151 is an apocalyptic number.

1581686151 is a deficient number, since it is larger than the sum of its proper divisors (586347129).

1581686151 is a wasteful number, since it uses less digits than its factorization.

1581686151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45766.

The product of its digits is 57600, while the sum is 42.

The square root of 1581686151 is about 39770.4180390400. The cubic root of 1581686151 is about 1165.1274584095.

The spelling of 1581686151 in words is "one billion, five hundred eighty-one million, six hundred eighty-six thousand, one hundred fifty-one".