121225537 has 4 divisors (see below), whose sum is σ = 121253076. Its totient is φ = 121198000.

The previous prime is 121225523. The next prime is 121225547. The reversal of 121225537 is 735522121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 735522121 = 7577 ⋅97073.

It can be written as a sum of positive squares in 2 ways, for example, as 72658576 + 48566961 = 8524^2 + 6969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121225537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121225547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5518 + ... + 16519.

It is an arithmetic number, because the mean of its divisors is an integer number (30313269).

Almost surely, 2^121225537 is an apocalyptic number.

It is an amenable number.

121225537 is a deficient number, since it is larger than the sum of its proper divisors (27539).

121225537 is an equidigital number, since it uses as much as digits as its factorization.

121225537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27538.

The product of its digits is 4200, while the sum is 28.

The square root of 121225537 is about 11010.2469091297. The cubic root of 121225537 is about 494.9158609499.

Adding to 121225537 its reverse (735522121), we get a palindrome (856747658).

The spelling of 121225537 in words is "one hundred twenty-one million, two hundred twenty-five thousand, five hundred thirty-seven".