87421571 has 4 divisors (see below), whose sum is σ = 87927072. Its totient is φ = 86916072.

The previous prime is 87421567. The next prime is 87421577. The reversal of 87421571 is 17512478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17512478 = 2 ⋅8756239.

It is a cyclic number.

It is not a de Polignac number, because 87421571 - 2² = 87421567 is a prime.

It is a super-2 number, since 2×87421571² = 15285062152216082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87421577) 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, 252491 + ... + 252836.

It is an arithmetic number, because the mean of its divisors is an integer number (21981768).

Almost surely, 2^87421571 is an apocalyptic number.

87421571 is a deficient number, since it is larger than the sum of its proper divisors (505501).

87421571 is a wasteful number, since it uses less digits than its factorization.

87421571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505500.

The product of its digits is 15680, while the sum is 35.

The square root of 87421571 is about 9349.9503207236. The cubic root of 87421571 is about 443.8193185106.

The spelling of 87421571 in words is "eighty-seven million, four hundred twenty-one thousand, five hundred seventy-one".