105139861 has 2 divisors, whose sum is σ = 105139862. Its totient is φ = 105139860.

The previous prime is 105139847. The next prime is 105139873. The reversal of 105139861 is 168931501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65512836 + 39627025 = 8094^2 + 6295^2 .

It is a cyclic number.

It is not a de Polignac number, because 105139861 - 2⁷ = 105139733 is a prime.

It is a super-2 number, since 2×105139861² = 22108780742198642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105139841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52569930 + 52569931.

It is an arithmetic number, because the mean of its divisors is an integer number (52569931).

Almost surely, 2^105139861 is an apocalyptic number.

It is an amenable number.

105139861 is a deficient number, since it is larger than the sum of its proper divisors (1).

105139861 is an equidigital number, since it uses as much as digits as its factorization.

105139861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 105139861 is about 10253.7730128963. The cubic root of 105139861 is about 471.9787722068.

The spelling of 105139861 in words is "one hundred five million, one hundred thirty-nine thousand, eight hundred sixty-one".