121131537 has 4 divisors (see below), whose sum is σ = 161508720. Its totient is φ = 80754356.

The previous prime is 121131533. The next prime is 121131541. The reversal of 121131537 is 735131121.

It is a happy number.

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.

It is an interprime number because it is at equal distance from previous prime (121131533) and next prime (121131541).

It is a cyclic number.

It is not a de Polignac number, because 121131537 - 2² = 121131533 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121131533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20188587 + ... + 20188592.

It is an arithmetic number, because the mean of its divisors is an integer number (40377180).

Almost surely, 2^121131537 is an apocalyptic number.

It is an amenable number.

121131537 is a deficient number, since it is larger than the sum of its proper divisors (40377183).

121131537 is an equidigital number, since it uses as much as digits as its factorization.

121131537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40377182.

The product of its digits is 630, while the sum is 24.

The square root of 121131537 is about 11005.9773305236. The cubic root of 121131537 is about 494.7879062799.

Adding to 121131537 its reverse (735131121), we get a palindrome (856262658).

The spelling of 121131537 in words is "one hundred twenty-one million, one hundred thirty-one thousand, five hundred thirty-seven".