139212137 has 2 divisors, whose sum is σ = 139212138. Its totient is φ = 139212136.

The previous prime is 139212127. The next prime is 139212149. The reversal of 139212137 is 731212931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119596096 + 19616041 = 10936^2 + 4429^2 .

It is a cyclic number.

It is not a de Polignac number, because 139212137 - 2⁴ = 139212121 is a prime.

It is equal to p_7870052 and since 139212137 and 7870052 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (139212127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69606068 + 69606069.

It is an arithmetic number, because the mean of its divisors is an integer number (69606069).

Almost surely, 2^139212137 is an apocalyptic number.

It is an amenable number.

139212137 is a deficient number, since it is larger than the sum of its proper divisors (1).

139212137 is an equidigital number, since it uses as much as digits as its factorization.

139212137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 29.

The square root of 139212137 is about 11798.8193053373. The cubic root of 139212137 is about 518.2735358576.

The spelling of 139212137 in words is "one hundred thirty-nine million, two hundred twelve thousand, one hundred thirty-seven".