121135731 has 4 divisors (see below), whose sum is σ = 161514312. Its totient is φ = 80757152.

The previous prime is 121135723. The next prime is 121135759. The reversal of 121135731 is 137531121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121135731 - 2³ = 121135723 is a prime.

It is a super-2 number, since 2×121135731² = 29347730649808722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121133731) 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, 20189286 + ... + 20189291.

It is an arithmetic number, because the mean of its divisors is an integer number (40378578).

Almost surely, 2^121135731 is an apocalyptic number.

121135731 is a deficient number, since it is larger than the sum of its proper divisors (40378581).

121135731 is an equidigital number, since it uses as much as digits as its factorization.

121135731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40378580.

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

The square root of 121135731 is about 11006.1678617037. The cubic root of 121135731 is about 494.7936166467.

Adding to 121135731 its reverse (137531121), we get a palindrome (258666852).

The spelling of 121135731 in words is "one hundred twenty-one million, one hundred thirty-five thousand, seven hundred thirty-one".