1981505703 has 8 divisors (see below), whose sum is σ = 2797419888. Its totient is φ = 1243297664.

The previous prime is 1981505699. The next prime is 1981505719. The reversal of 1981505703 is 3075051891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1981505703 - 2² = 1981505699 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981505203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19426476 + ... + 19426577.

It is an arithmetic number, because the mean of its divisors is an integer number (349677486).

Almost surely, 2^1981505703 is an apocalyptic number.

1981505703 is a deficient number, since it is larger than the sum of its proper divisors (815914185).

1981505703 is a wasteful number, since it uses less digits than its factorization.

1981505703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38853073.

The product of its (nonzero) digits is 37800, while the sum is 39.

The square root of 1981505703 is about 44514.1067865008. The cubic root of 1981505703 is about 1256.0254583853.

The spelling of 1981505703 in words is "one billion, nine hundred eighty-one million, five hundred five thousand, seven hundred three".