1947984080531 has 4 divisors (see below), whose sum is σ = 1969871542200. Its totient is φ = 1926096618864.

The previous prime is 1947984080521. The next prime is 1947984080561. The reversal of 1947984080531 is 1350804897491.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1947984080531 is a prime.

It is a super-2 number, since 2×1947984080531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1947984080521) 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, 10943730701 + ... + 10943730878.

It is an arithmetic number, because the mean of its divisors is an integer number (492467885550).

Almost surely, 2^{1947984080531} is an apocalyptic number.

1947984080531 is a deficient number, since it is larger than the sum of its proper divisors (21887461669).

1947984080531 is an equidigital number, since it uses as much as digits as its factorization.

1947984080531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21887461668.

The product of its (nonzero) digits is 8709120, while the sum is 59.

The spelling of 1947984080531 in words is "one trillion, nine hundred forty-seven billion, nine hundred eighty-four million, eighty thousand, five hundred thirty-one".