87949709 has 2 divisors, whose sum is σ = 87949710. Its totient is φ = 87949708.

The previous prime is 87949691. The next prime is 87949717. The reversal of 87949709 is 90794978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77387209 + 10562500 = 8797^2 + 3250^2 .

It is a cyclic number.

It is not a de Polignac number, because 87949709 - 2⁸ = 87949453 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87949009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43974854 + 43974855.

It is an arithmetic number, because the mean of its divisors is an integer number (43974855).

Almost surely, 2^87949709 is an apocalyptic number.

It is an amenable number.

87949709 is a deficient number, since it is larger than the sum of its proper divisors (1).

87949709 is an equidigital number, since it uses as much as digits as its factorization.

87949709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 87949709 is about 9378.1506172592. The cubic root of 87949709 is about 444.7112700110.

The spelling of 87949709 in words is "eighty-seven million, nine hundred forty-nine thousand, seven hundred nine".