1881509012 has 6 divisors (see below), whose sum is σ = 3292640778. Its totient is φ = 940754504.

The previous prime is 1881509011. The next prime is 1881509023. The reversal of 1881509012 is 2109051881.

It can be written as a sum of positive squares in only one way, i.e., 1169366416 + 712142596 = 34196^2 + 26686^2 .

It is a super-2 number, since 2×1881509012² = 7080152324474432288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881509011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 235188623 + ... + 235188630.

It is an arithmetic number, because the mean of its divisors is an integer number (548773463).

Almost surely, 2^1881509012 is an apocalyptic number.

It is an amenable number.

1881509012 is a deficient number, since it is larger than the sum of its proper divisors (1411131766).

1881509012 is a wasteful number, since it uses less digits than its factorization.

1881509012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470377257 (or 470377255 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 1881509012 is about 43376.3646701749. The cubic root of 1881509012 is about 1234.5312873283.

The spelling of 1881509012 in words is "one billion, eight hundred eighty-one million, five hundred nine thousand, twelve".