102240115561 has 2 divisors, whose sum is σ = 102240115562. Its totient is φ = 102240115560.

The previous prime is 102240115513. The next prime is 102240115589. The reversal of 102240115561 is 165511042201.

It is an a-pointer prime, because the next prime (102240115589) can be obtained adding 102240115561 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51544891225 + 50695224336 = 227035^2 + 225156^2 .

It is a cyclic number.

It is not a de Polignac number, because 102240115561 - 2⁹ = 102240115049 is a prime.

It is not a weakly prime, because it can be changed into another prime (102240115511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51120057780 + 51120057781.

It is an arithmetic number, because the mean of its divisors is an integer number (51120057781).

Almost surely, 2^102240115561 is an apocalyptic number.

It is an amenable number.

102240115561 is a deficient number, since it is larger than the sum of its proper divisors (1).

102240115561 is an equidigital number, since it uses as much as digits as its factorization.

102240115561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 102240115561 its reverse (165511042201), we get a palindrome (267751157762).

The spelling of 102240115561 in words is "one hundred two billion, two hundred forty million, one hundred fifteen thousand, five hundred sixty-one".