1981962047 has 4 divisors (see below), whose sum is σ = 2134420680. Its totient is φ = 1829503416.

The previous prime is 1981962019. The next prime is 1981962061. The reversal of 1981962047 is 7402691891.

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

It is not a de Polignac number, because 1981962047 - 2⁸ = 1981961791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1981961992 and 1981962010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981962347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76229297 + ... + 76229322.

It is an arithmetic number, because the mean of its divisors is an integer number (533605170).

Almost surely, 2^1981962047 is an apocalyptic number.

1981962047 is a deficient number, since it is larger than the sum of its proper divisors (152458633).

1981962047 is a wasteful number, since it uses less digits than its factorization.

1981962047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152458632.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 1981962047 is about 44519.2323271640. The cubic root of 1981962047 is about 1256.1218725558.

The spelling of 1981962047 in words is "one billion, nine hundred eighty-one million, nine hundred sixty-two thousand, forty-seven".