139214861 has 2 divisors, whose sum is σ = 139214862. Its totient is φ = 139214860.

The previous prime is 139214851. The next prime is 139214863. The reversal of 139214861 is 168412931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134699236 + 4515625 = 11606^2 + 2125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139214861 is a prime.

Together with 139214863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139214863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69607430 + 69607431.

It is an arithmetic number, because the mean of its divisors is an integer number (69607431).

Almost surely, 2^139214861 is an apocalyptic number.

It is an amenable number.

139214861 is a deficient number, since it is larger than the sum of its proper divisors (1).

139214861 is an equidigital number, since it uses as much as digits as its factorization.

139214861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 139214861 is about 11798.9347400517. The cubic root of 139214861 is about 518.2769162331.

The spelling of 139214861 in words is "one hundred thirty-nine million, two hundred fourteen thousand, eight hundred sixty-one".