102878261 has 2 divisors, whose sum is σ = 102878262. Its totient is φ = 102878260.

The previous prime is 102878257. The next prime is 102878273. The reversal of 102878261 is 162878201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97634161 + 5244100 = 9881^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 102878261 - 2² = 102878257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102878221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51439130 + 51439131.

It is an arithmetic number, because the mean of its divisors is an integer number (51439131).

Almost surely, 2^102878261 is an apocalyptic number.

It is an amenable number.

102878261 is a deficient number, since it is larger than the sum of its proper divisors (1).

102878261 is an equidigital number, since it uses as much as digits as its factorization.

102878261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 102878261 is about 10142.8921417907. The cubic root of 102878261 is about 468.5700631803.

The spelling of 102878261 in words is "one hundred two million, eight hundred seventy-eight thousand, two hundred sixty-one".