1581273473 has 16 divisors (see below), whose sum is σ = 1727308800. Its totient is φ = 1438852800.

The previous prime is 1581273467. The next prime is 1581273481. The reversal of 1581273473 is 3743721851.

It is a cyclic number.

It is not a de Polignac number, because 1581273473 - 2⁶ = 1581273409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1581273473.

It is not an unprimeable number, because it can be changed into a prime (1581293473) 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 15 ways as a sum of consecutive naturals, for example, 311288 + ... + 316326.

It is an arithmetic number, because the mean of its divisors is an integer number (107956800).

Almost surely, 2^1581273473 is an apocalyptic number.

1581273473 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1581273473 is a deficient number, since it is larger than the sum of its proper divisors (146035327).

1581273473 is a wasteful number, since it uses less digits than its factorization.

1581273473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5392.

The product of its digits is 141120, while the sum is 41.

The square root of 1581273473 is about 39765.2294473451. The cubic root of 1581273473 is about 1165.0261183950.

The spelling of 1581273473 in words is "one billion, five hundred eighty-one million, two hundred seventy-three thousand, four hundred seventy-three".