1581361803 has 48 divisors (see below), whose sum is σ = 2752329216. Its totient is φ = 855360000.

The previous prime is 1581361799. The next prime is 1581361813. The reversal of 1581361803 is 3081631851.

It is not a de Polignac number, because 1581361803 - 2² = 1581361799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1581361813) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 134928 + ... + 146178.

It is an arithmetic number, because the mean of its divisors is an integer number (57340192).

Almost surely, 2^1581361803 is an apocalyptic number.

1581361803 is a deficient number, since it is larger than the sum of its proper divisors (1170967413).

1581361803 is a wasteful number, since it uses less digits than its factorization.

1581361803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11384 (or 11381 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1581361803 is about 39766.3400754960. The cubic root of 1581361803 is about 1165.0478107930.

The spelling of 1581361803 in words is "one billion, five hundred eighty-one million, three hundred sixty-one thousand, eight hundred three".