87801731 has 2 divisors, whose sum is σ = 87801732. Its totient is φ = 87801730.

The previous prime is 87801697. The next prime is 87801767. The reversal of 87801731 is 13710878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87801731 - 2⁶ = 87801667 is a prime.

It is a super-2 number, since 2×87801731² = 15418287933192722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 87801691 and 87801700.

It is not a weakly prime, because it can be changed into another prime (87801431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43900865 + 43900866.

It is an arithmetic number, because the mean of its divisors is an integer number (43900866).

Almost surely, 2^87801731 is an apocalyptic number.

87801731 is a deficient number, since it is larger than the sum of its proper divisors (1).

87801731 is an equidigital number, since it uses as much as digits as its factorization.

87801731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 87801731 is about 9370.2577872757. The cubic root of 87801731 is about 444.4617166875.

The spelling of 87801731 in words is "eighty-seven million, eight hundred one thousand, seven hundred thirty-one".