87650261 has 2 divisors, whose sum is σ = 87650262. Its totient is φ = 87650260.

The previous prime is 87650257. The next prime is 87650357. The reversal of 87650261 is 16205678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73444900 + 14205361 = 8570^2 + 3769^2 .

It is a cyclic number.

It is not a de Polignac number, because 87650261 - 2² = 87650257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87650201) 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, 43825130 + 43825131.

It is an arithmetic number, because the mean of its divisors is an integer number (43825131).

Almost surely, 2^87650261 is an apocalyptic number.

It is an amenable number.

87650261 is a deficient number, since it is larger than the sum of its proper divisors (1).

87650261 is an equidigital number, since it uses as much as digits as its factorization.

87650261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 87650261 is about 9362.1718100022. The cubic root of 87650261 is about 444.2059838139.

The spelling of 87650261 in words is "eighty-seven million, six hundred fifty thousand, two hundred sixty-one".