1581439053381 has 16 divisors (see below), whose sum is σ = 2301021250560. Its totient is φ = 958136967920.

The previous prime is 1581439053371. The next prime is 1581439053409. The reversal of 1581439053381 is 1833509341851.

It is not a de Polignac number, because 1581439053381 - 2⁶ = 1581439053317 is a prime.

It is a super-2 number, since 2×1581439053381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581439053371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7670301 + ... + 7873778.

It is an arithmetic number, because the mean of its divisors is an integer number (143813828160).

Almost surely, 2^{1581439053381} is an apocalyptic number.

1581439053381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1581439053381 is a deficient number, since it is larger than the sum of its proper divisors (719582197179).

1581439053381 is a wasteful number, since it uses less digits than its factorization.

1581439053381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15547176.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 1581439053381 in words is "one trillion, five hundred eighty-one billion, four hundred thirty-nine million, fifty-three thousand, three hundred eighty-one".