136206251 has 2 divisors, whose sum is σ = 136206252. Its totient is φ = 136206250.

The previous prime is 136206233. The next prime is 136206263. The reversal of 136206251 is 152602631.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136206251 is a prime.

It is a super-2 number, since 2×136206251² = 37104285622950002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 136206251.

It is not a weakly prime, because it can be changed into another prime (136206221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68103125 + 68103126.

It is an arithmetic number, because the mean of its divisors is an integer number (68103126).

Almost surely, 2^136206251 is an apocalyptic number.

136206251 is a deficient number, since it is larger than the sum of its proper divisors (1).

136206251 is an equidigital number, since it uses as much as digits as its factorization.

136206251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 136206251 is about 11670.7433782086. The cubic root of 136206251 is about 514.5161522171.

Adding to 136206251 its reverse (152602631), we get a palindrome (288808882).

The spelling of 136206251 in words is "one hundred thirty-six million, two hundred six thousand, two hundred fifty-one".