1581438485 has 16 divisors (see below), whose sum is σ = 2160259200. Its totient is φ = 1100130240.

The previous prime is 1581438407. The next prime is 1581438517. The reversal of 1581438485 is 5848341851.

It is not a de Polignac number, because 1581438485 - 2²² = 1577244181 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623810 + ... + 626339.

It is an arithmetic number, because the mean of its divisors is an integer number (135016200).

Almost surely, 2^1581438485 is an apocalyptic number.

It is an amenable number.

1581438485 is a deficient number, since it is larger than the sum of its proper divisors (578820715).

1581438485 is a wasteful number, since it uses less digits than its factorization.

1581438485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250188.

The product of its digits is 614400, while the sum is 47.

The square root of 1581438485 is about 39767.3042209300. The cubic root of 1581438485 is about 1165.0666419785.

The spelling of 1581438485 in words is "one billion, five hundred eighty-one million, four hundred thirty-eight thousand, four hundred eighty-five".