135877121 has 2 divisors, whose sum is σ = 135877122. Its totient is φ = 135877120.

The previous prime is 135877103. The next prime is 135877129. The reversal of 135877121 is 121778531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118026496 + 17850625 = 10864^2 + 4225^2 .

It is a cyclic number.

It is not a de Polignac number, because 135877121 - 2⁶ = 135877057 is a prime.

It is a super-2 number, since 2×135877121² = 36925184022497282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (135877129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67938560 + 67938561.

It is an arithmetic number, because the mean of its divisors is an integer number (67938561).

Almost surely, 2^135877121 is an apocalyptic number.

It is an amenable number.

135877121 is a deficient number, since it is larger than the sum of its proper divisors (1).

135877121 is an equidigital number, since it uses as much as digits as its factorization.

135877121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 35.

The square root of 135877121 is about 11656.6342054643. The cubic root of 135877121 is about 514.1013908198.

The spelling of 135877121 in words is "one hundred thirty-five million, eight hundred seventy-seven thousand, one hundred twenty-one".