1656461947 has 8 divisors (see below), whose sum is σ = 1928818656. Its totient is φ = 1393035072.

The previous prime is 1656461921. The next prime is 1656461957. The reversal of 1656461947 is 7491646561.

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 1656461947 - 2¹¹ = 1656459899 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 1656461947.

It is not an unprimeable number, because it can be changed into a prime (1656461957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2232058 + ... + 2232799.

It is an arithmetic number, because the mean of its divisors is an integer number (241102332).

Almost surely, 2^1656461947 is an apocalyptic number.

1656461947 is a deficient number, since it is larger than the sum of its proper divisors (272356709).

1656461947 is an equidigital number, since it uses as much as digits as its factorization.

1656461947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4464917.

The product of its digits is 1088640, while the sum is 49.

The square root of 1656461947 is about 40699.6553670913. The cubic root of 1656461947 is about 1183.2063393351.

The spelling of 1656461947 in words is "one billion, six hundred fifty-six million, four hundred sixty-one thousand, nine hundred forty-seven".