102070781 has 2 divisors, whose sum is σ = 102070782. Its totient is φ = 102070780.

The previous prime is 102070769. The next prime is 102070783. The reversal of 102070781 is 187070201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82973881 + 19096900 = 9109^2 + 4370^2 .

It is a cyclic number.

It is not a de Polignac number, because 102070781 - 2¹⁴ = 102054397 is a prime.

It is a super-2 number, since 2×102070781² = 20836888667899922, which contains 22 as substring.

Together with 102070783, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102070781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102070783) 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, 51035390 + 51035391.

It is an arithmetic number, because the mean of its divisors is an integer number (51035391).

Almost surely, 2^102070781 is an apocalyptic number.

It is an amenable number.

102070781 is a deficient number, since it is larger than the sum of its proper divisors (1).

102070781 is an equidigital number, since it uses as much as digits as its factorization.

102070781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 102070781 is about 10103.0085123195. The cubic root of 102070781 is about 467.3409236957.

The spelling of 102070781 in words is "one hundred two million, seventy thousand, seven hundred eighty-one".