102720089 has 2 divisors, whose sum is σ = 102720090. Its totient is φ = 102720088.

The previous prime is 102720067. The next prime is 102720119. The reversal of 102720089 is 980027201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81144064 + 21576025 = 9008^2 + 4645^2 .

It is a cyclic number.

It is not a de Polignac number, because 102720089 - 2¹² = 102715993 is a prime.

It is a Chen prime.

It is equal to p_5909123 and since 102720089 and 5909123 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (102720589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51360044 + 51360045.

It is an arithmetic number, because the mean of its divisors is an integer number (51360045).

Almost surely, 2^102720089 is an apocalyptic number.

It is an amenable number.

102720089 is a deficient number, since it is larger than the sum of its proper divisors (1).

102720089 is an equidigital number, since it uses as much as digits as its factorization.

102720089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 102720089 is about 10135.0919581423. The cubic root of 102720089 is about 468.3298029000.

The spelling of 102720089 in words is "one hundred two million, seven hundred twenty thousand, eighty-nine".