87031493 has 2 divisors, whose sum is σ = 87031494. Its totient is φ = 87031492.

The previous prime is 87031463. The next prime is 87031501. The reversal of 87031493 is 39413078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78464164 + 8567329 = 8858^2 + 2927^2 .

It is a cyclic number.

It is not a de Polignac number, because 87031493 - 2⁶ = 87031429 is a prime.

It is a super-3 number, since 3×87031493³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87031423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43515746 + 43515747.

It is an arithmetic number, because the mean of its divisors is an integer number (43515747).

Almost surely, 2^87031493 is an apocalyptic number.

It is an amenable number.

87031493 is a deficient number, since it is larger than the sum of its proper divisors (1).

87031493 is an equidigital number, since it uses as much as digits as its factorization.

87031493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 87031493 is about 9329.0671023420. The cubic root of 87031493 is about 443.1582219962.

The spelling of 87031493 in words is "eighty-seven million, thirty-one thousand, four hundred ninety-three".