87142621 has 2 divisors, whose sum is σ = 87142622. Its totient is φ = 87142620.

The previous prime is 87142603. The next prime is 87142633. The reversal of 87142621 is 12624178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69122596 + 18020025 = 8314^2 + 4245^2 .

It is a cyclic number.

It is not a de Polignac number, because 87142621 - 2⁹ = 87142109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87142021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43571310 + 43571311.

It is an arithmetic number, because the mean of its divisors is an integer number (43571311).

Almost surely, 2^87142621 is an apocalyptic number.

It is an amenable number.

87142621 is a deficient number, since it is larger than the sum of its proper divisors (1).

87142621 is an equidigital number, since it uses as much as digits as its factorization.

87142621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 87142621 is about 9335.0212104740. The cubic root of 87142621 is about 443.3467604177.

Adding to 87142621 its reverse (12624178), we get a palindrome (99766799).

The spelling of 87142621 in words is "eighty-seven million, one hundred forty-two thousand, six hundred twenty-one".