1981180562 has 4 divisors (see below), whose sum is σ = 2971770846. Its totient is φ = 990590280.

The previous prime is 1981180517. The next prime is 1981180567. The reversal of 1981180562 is 2650811891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1050991561 + 930189001 = 32419^2 + 30499^2 .

It is not an unprimeable number, because it can be changed into a prime (1981180567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495295139 + ... + 495295142.

Almost surely, 2^1981180562 is an apocalyptic number.

1981180562 is a deficient number, since it is larger than the sum of its proper divisors (990590284).

1981180562 is an equidigital number, since it uses as much as digits as its factorization.

1981180562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990590283.

The product of its (nonzero) digits is 34560, while the sum is 41.

The square root of 1981180562 is about 44510.4545247518. The cubic root of 1981180562 is about 1255.9567551239.

The spelling of 1981180562 in words is "one billion, nine hundred eighty-one million, one hundred eighty thousand, five hundred sixty-two".