87145973 has 2 divisors, whose sum is σ = 87145974. Its totient is φ = 87145972.

The previous prime is 87145969. The next prime is 87145987. The reversal of 87145973 is 37954178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47430769 + 39715204 = 6887^2 + 6302^2 .

It is a cyclic number.

It is not a de Polignac number, because 87145973 - 2² = 87145969 is a prime.

It is a super-2 number, since 2×87145973² = 15188841220233458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87145963) 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, 43572986 + 43572987.

It is an arithmetic number, because the mean of its divisors is an integer number (43572987).

Almost surely, 2^87145973 is an apocalyptic number.

It is an amenable number.

87145973 is a deficient number, since it is larger than the sum of its proper divisors (1).

87145973 is an equidigital number, since it uses as much as digits as its factorization.

87145973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 87145973 is about 9335.2007477076. The cubic root of 87145973 is about 443.3524448894.

The spelling of 87145973 in words is "eighty-seven million, one hundred forty-five thousand, nine hundred seventy-three".