121028137 has 2 divisors, whose sum is σ = 121028138. Its totient is φ = 121028136.

The previous prime is 121028113. The next prime is 121028143. The reversal of 121028137 is 731820121.

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., 72182016 + 48846121 = 8496^2 + 6989^2 .

It is an emirp because it is prime and its reverse (731820121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121028137 - 2¹⁹ = 120503849 is a prime.

It is not a weakly prime, because it can be changed into another prime (121028837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60514068 + 60514069.

It is an arithmetic number, because the mean of its divisors is an integer number (60514069).

Almost surely, 2^121028137 is an apocalyptic number.

It is an amenable number.

121028137 is a deficient number, since it is larger than the sum of its proper divisors (1).

121028137 is an equidigital number, since it uses as much as digits as its factorization.

121028137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 121028137 is about 11001.2788802030. The cubic root of 121028137 is about 494.6470796628.

Adding to 121028137 its reverse (731820121), we get a palindrome (852848258).

The spelling of 121028137 in words is "one hundred twenty-one million, twenty-eight thousand, one hundred thirty-seven".