47971661 has 6 divisors (see below), whose sum is σ = 48802062. Its totient is φ = 47155160.

The previous prime is 47971657. The next prime is 47971673. The reversal of 47971661 is 16617974.

It can be written as a sum of positive squares in only one way, i.e., 42120100 + 5851561 = 6490^2 + 2419^2 .

It is not a de Polignac number, because 47971661 - 2² = 47971657 is a prime.

It is a super-3 number, since 3×47971661³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47971361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3410 + ... + 10371.

It is an arithmetic number, because the mean of its divisors is an integer number (8133677).

Almost surely, 2^47971661 is an apocalyptic number.

It is an amenable number.

47971661 is a deficient number, since it is larger than the sum of its proper divisors (830401).

47971661 is an equidigital number, since it uses as much as digits as its factorization.

47971661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13899 (or 13840 counting only the distinct ones).

The product of its digits is 63504, while the sum is 41.

The square root of 47971661 is about 6926.1577371585. The cubic root of 47971661 is about 363.3525831247.

The spelling of 47971661 in words is "forty-seven million, nine hundred seventy-one thousand, six hundred sixty-one".