135621037 has 2 divisors, whose sum is σ = 135621038. Its totient is φ = 135621036.

The previous prime is 135620987. The next prime is 135621047. The reversal of 135621037 is 730126531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126585001 + 9036036 = 11251^2 + 3006^2 .

It is an emirp because it is prime and its reverse (730126531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135621037 - 2⁷ = 135620909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135620996 and 135621014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135621047) 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, 67810518 + 67810519.

It is an arithmetic number, because the mean of its divisors is an integer number (67810519).

Almost surely, 2^135621037 is an apocalyptic number.

It is an amenable number.

135621037 is a deficient number, since it is larger than the sum of its proper divisors (1).

135621037 is an equidigital number, since it uses as much as digits as its factorization.

135621037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 135621037 is about 11645.6445506464. The cubic root of 135621037 is about 513.7782166311.

Adding to 135621037 its reverse (730126531), we get a palindrome (865747568).

The spelling of 135621037 in words is "one hundred thirty-five million, six hundred twenty-one thousand, thirty-seven".