1981762513 has 8 divisors (see below), whose sum is σ = 2100980480. Its totient is φ = 1866000240.

The previous prime is 1981762499. The next prime is 1981762553. The reversal of 1981762513 is 3152671891.

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 1981762513 - 2⁹ = 1981762001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1981762513.

It is not an unprimeable number, because it can be changed into a prime (1981762553) 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, 862743 + ... + 865036.

It is an arithmetic number, because the mean of its divisors is an integer number (262622560).

Almost surely, 2^1981762513 is an apocalyptic number.

It is an amenable number.

1981762513 is a deficient number, since it is larger than the sum of its proper divisors (119217967).

1981762513 is a wasteful number, since it uses less digits than its factorization.

1981762513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727847.

The product of its digits is 90720, while the sum is 43.

The square root of 1981762513 is about 44516.9912842276. The cubic root of 1981762513 is about 1256.0797177907.

The spelling of 1981762513 in words is "one billion, nine hundred eighty-one million, seven hundred sixty-two thousand, five hundred thirteen".