137751121 has 4 divisors (see below), whose sum is σ = 145001200. Its totient is φ = 130501044.

The previous prime is 137751101. The next prime is 137751127. The reversal of 137751121 is 121157731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121157731 = 137 ⋅884363.

It is not a de Polignac number, because 137751121 - 2¹⁹ = 137226833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137751121.

It is not an unprimeable number, because it can be changed into a prime (137751127) 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 in 3 ways as a sum of consecutive naturals, for example, 3625011 + ... + 3625048.

It is an arithmetic number, because the mean of its divisors is an integer number (36250300).

Almost surely, 2^137751121 is an apocalyptic number.

It is an amenable number.

137751121 is a deficient number, since it is larger than the sum of its proper divisors (7250079).

137751121 is an equidigital number, since it uses as much as digits as its factorization.

137751121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7250078.

The product of its digits is 1470, while the sum is 28.

The square root of 137751121 is about 11736.7423504139. The cubic root of 137751121 is about 516.4540814408.

The spelling of 137751121 in words is "one hundred thirty-seven million, seven hundred fifty-one thousand, one hundred twenty-one".