47311661 has 4 divisors (see below), whose sum is σ = 48087324. Its totient is φ = 46536000.

The previous prime is 47311651. The next prime is 47311699. The reversal of 47311661 is 16611374.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4866436 + 42445225 = 2206^2 + 6515^2 .

It is a cyclic number.

It is not a de Polignac number, because 47311661 - 2⁶ = 47311597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47311651) 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, 387740 + ... + 387861.

It is an arithmetic number, because the mean of its divisors is an integer number (12021831).

Almost surely, 2^47311661 is an apocalyptic number.

It is an amenable number.

47311661 is a deficient number, since it is larger than the sum of its proper divisors (775663).

47311661 is an equidigital number, since it uses as much as digits as its factorization.

47311661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775662.

The product of its digits is 3024, while the sum is 29.

The square root of 47311661 is about 6878.3472578811. The cubic root of 47311661 is about 361.6785324127.

The spelling of 47311661 in words is "forty-seven million, three hundred eleven thousand, six hundred sixty-one".