136720469 has 2 divisors, whose sum is σ = 136720470. Its totient is φ = 136720468.

The previous prime is 136720411. The next prime is 136720489. The reversal of 136720469 is 964027631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72880369 + 63840100 = 8537^2 + 7990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136720469 is a prime.

It is a super-2 number, since 2×136720469² = 37384973287159922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136720489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68360234 + 68360235.

It is an arithmetic number, because the mean of its divisors is an integer number (68360235).

Almost surely, 2^136720469 is an apocalyptic number.

It is an amenable number.

136720469 is a deficient number, since it is larger than the sum of its proper divisors (1).

136720469 is an equidigital number, since it uses as much as digits as its factorization.

136720469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 136720469 is about 11692.7528409695. The cubic root of 136720469 is about 515.1628215495.

The spelling of 136720469 in words is "one hundred thirty-six million, seven hundred twenty thousand, four hundred sixty-nine".