136221461 has 2 divisors, whose sum is σ = 136221462.
Its totient is φ = 136221460.
The previous prime is 136221451. The next prime is 136221467. The reversal of 136221461 is 164122631.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 75864100 + 60357361 = 8710^2 + 7769^2
It is a cyclic number.
It is not a de Polignac number, because 136221461 - 210 = 136220437 is a prime.
It is equal to p7710542 and since 136221461 and 7710542 have the same sum of digits, it is a Honaker prime.
It is a self number, because there is not a number n which added to its sum of digits gives 136221461.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (136221467) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68110730 + 68110731.
It is an arithmetic number, because the mean of its divisors is an integer number (68110731).
Almost surely, 2136221461 is an apocalyptic number.
It is an amenable number.
136221461 is a deficient number, since it is larger than the sum of its proper divisors (1).
136221461 is an equidigital number, since it uses as much as digits as its factorization.
136221461 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1728, while the sum is 26.
The square root of 136221461 is about 11671.3949894603.
The cubic root of 136221461 is about 514.5353033191.
The spelling of 136221461 in words is "one hundred thirty-six million, two hundred twenty-one thousand, four hundred sixty-one".