1611872947 has 4 divisors (see below), whose sum is σ = 1612584360. Its totient is φ = 1611161536.

The previous prime is 1611872929. The next prime is 1611872971. The reversal of 1611872947 is 7492781161.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1611872947 - 2⁷ = 1611872819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1611872897 and 1611872906.

It is not an unprimeable number, because it can be changed into a prime (1611872987) 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, 352297 + ... + 356842.

It is an arithmetic number, because the mean of its divisors is an integer number (403146090).

Almost surely, 2^1611872947 is an apocalyptic number.

1611872947 is a deficient number, since it is larger than the sum of its proper divisors (711413).

1611872947 is an equidigital number, since it uses as much as digits as its factorization.

1611872947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711412.

The product of its digits is 169344, while the sum is 46.

The square root of 1611872947 is about 40148.1375284085. The cubic root of 1611872947 is about 1172.4930275407.

The spelling of 1611872947 in words is "one billion, six hundred eleven million, eight hundred seventy-two thousand, nine hundred forty-seven".