87961471 has 4 divisors (see below), whose sum is σ = 94727752. Its totient is φ = 81195192.

The previous prime is 87961463. The next prime is 87961481. The reversal of 87961471 is 17416978.

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

It is not a de Polignac number, because 87961471 - 2³ = 87961463 is a prime.

It is a super-3 number, since 3×87961471³ (a number of 25 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 (87961411) 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 3 ways as a sum of consecutive naturals, for example, 3383121 + ... + 3383146.

It is an arithmetic number, because the mean of its divisors is an integer number (23681938).

Almost surely, 2^87961471 is an apocalyptic number.

87961471 is a deficient number, since it is larger than the sum of its proper divisors (6766281).

87961471 is a wasteful number, since it uses less digits than its factorization.

87961471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6766280.

The product of its digits is 84672, while the sum is 43.

The square root of 87961471 is about 9378.7776922155. Note that the first 3 decimals coincide. The cubic root of 87961471 is about 444.7310936915.

The spelling of 87961471 in words is "eighty-seven million, nine hundred sixty-one thousand, four hundred seventy-one".