135699251 has 2 divisors, whose sum is σ = 135699252. Its totient is φ = 135699250.

The previous prime is 135699191. The next prime is 135699259. The reversal of 135699251 is 152996531.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135699251 - 2¹⁴ = 135682867 is a prime.

It is a super-2 number, since 2×135699251² = 36828573443922002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 135699199 and 135699208.

It is not a weakly prime, because it can be changed into another prime (135699259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67849625 + 67849626.

It is an arithmetic number, because the mean of its divisors is an integer number (67849626).

Almost surely, 2^135699251 is an apocalyptic number.

135699251 is a deficient number, since it is larger than the sum of its proper divisors (1).

135699251 is an equidigital number, since it uses as much as digits as its factorization.

135699251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72900, while the sum is 41.

The square root of 135699251 is about 11649.0021461068. The cubic root of 135699251 is about 513.8769646519.

The spelling of 135699251 in words is "one hundred thirty-five million, six hundred ninety-nine thousand, two hundred fifty-one".