87451571 has 2 divisors, whose sum is σ = 87451572. Its totient is φ = 87451570.

The previous prime is 87451531. The next prime is 87451577. The reversal of 87451571 is 17515478.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87451571 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87451577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43725785 + 43725786.

It is an arithmetic number, because the mean of its divisors is an integer number (43725786).

Almost surely, 2^87451571 is an apocalyptic number.

87451571 is a deficient number, since it is larger than the sum of its proper divisors (1).

87451571 is an equidigital number, since it uses as much as digits as its factorization.

87451571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39200, while the sum is 38.

The square root of 87451571 is about 9351.5544697125. The cubic root of 87451571 is about 443.8700804170.

The spelling of 87451571 in words is "eighty-seven million, four hundred fifty-one thousand, five hundred seventy-one".