1581643041 has 32 divisors (see below), whose sum is σ = 2325818880. Its totient is φ = 948105600.

The previous prime is 1581643027. The next prime is 1581643051. The reversal of 1581643041 is 1403461851.

It is not a de Polignac number, because 1581643041 - 2⁵ = 1581643009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 1581642993 and 1581643011.

It is not an unprimeable number, because it can be changed into a prime (1581643051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2459466 + ... + 2460108.

It is an arithmetic number, because the mean of its divisors is an integer number (72681840).

Almost surely, 2^1581643041 is an apocalyptic number.

1581643041 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1581643041 is a deficient number, since it is larger than the sum of its proper divisors (744175839).

1581643041 is a wasteful number, since it uses less digits than its factorization.

1581643041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1581643041 is about 39769.8760495931. The cubic root of 1581643041 is about 1165.1168728494.

The spelling of 1581643041 in words is "one billion, five hundred eighty-one million, six hundred forty-three thousand, forty-one".