87949009 has 2 divisors, whose sum is σ = 87949010. Its totient is φ = 87949008.

The previous prime is 87949003. The next prime is 87949019. The reversal of 87949009 is 90094978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86118400 + 1830609 = 9280^2 + 1353^2 .

It is a cyclic number.

It is not a de Polignac number, because 87949009 - 2¹¹ = 87946961 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87949009.

It is not a weakly prime, because it can be changed into another prime (87949003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43974504 + 43974505.

It is an arithmetic number, because the mean of its divisors is an integer number (43974505).

Almost surely, 2^87949009 is an apocalyptic number.

It is an amenable number.

87949009 is a deficient number, since it is larger than the sum of its proper divisors (1).

87949009 is an equidigital number, since it uses as much as digits as its factorization.

87949009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 87949009 is about 9378.1132963939. The cubic root of 87949009 is about 444.7100901749.

The spelling of 87949009 in words is "eighty-seven million, nine hundred forty-nine thousand, nine".