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87631 is a prime number
BaseRepresentation
bin10101011001001111
311110012121
4111121033
510301011
61513411
7513325
oct253117
9143177
1087631
115a925
1242867
1330b6b
1423d15
151ae71
hex1564f

87631 has 2 divisors, whose sum is σ = 87632. Its totient is φ = 87630.

The previous prime is 87629. The next prime is 87641. The reversal of 87631 is 13678.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87631 - 21 = 87629 is a prime.

It is a super-2 number, since 2×876312 = 15358384322, which contains 22 as substring.

Together with 87629, it forms a pair of twin primes.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 87596 and 87605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43815 + 43816.

It is an arithmetic number, because the mean of its divisors is an integer number (43816).

287631 is an apocalyptic number.

87631 is a deficient number, since it is larger than the sum of its proper divisors (1).

87631 is an equidigital number, since it uses as much as digits as its factorization.

87631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 25.

The square root of 87631 is about 296.0253367535. The cubic root of 87631 is about 44.4173443587.

The spelling of 87631 in words is "eighty-seven thousand, six hundred thirty-one".