1981761603 has 8 divisors (see below), whose sum is σ = 2733464400. Its totient is φ = 1275616608.

The previous prime is 1981761601. The next prime is 1981761619. The reversal of 1981761603 is 3061671891.

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

It is not a de Polignac number, because 1981761603 - 2¹ = 1981761601 is a prime.

It is a super-2 number, since 2×1981761603² = 7854758102250259218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1981761601) 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, 11389348 + ... + 11389521.

It is an arithmetic number, because the mean of its divisors is an integer number (341683050).

Almost surely, 2^1981761603 is an apocalyptic number.

1981761603 is a deficient number, since it is larger than the sum of its proper divisors (751702797).

1981761603 is a wasteful number, since it uses less digits than its factorization.

1981761603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22778901.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1981761603 is about 44516.9810634099. The cubic root of 1981761603 is about 1256.0795255321.

The spelling of 1981761603 in words is "one billion, nine hundred eighty-one million, seven hundred sixty-one thousand, six hundred three".