121351731 has 16 divisors (see below), whose sum is σ = 164947200. Its totient is φ = 79335648.

The previous prime is 121351669. The next prime is 121351733. The reversal of 121351731 is 137153121.

It is a happy number.

It is not a de Polignac number, because 121351731 - 2⁶ = 121351667 is a prime.

It is a super-2 number, since 2×121351731² = 29452485233392722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121351733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125010 + ... + 125976.

It is an arithmetic number, because the mean of its divisors is an integer number (10309200).

Almost surely, 2^121351731 is an apocalyptic number.

121351731 is a deficient number, since it is larger than the sum of its proper divisors (43595469).

121351731 is an equidigital number, since it uses as much as digits as its factorization.

121351731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738.

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

The square root of 121351731 is about 11015.9761709982. The cubic root of 121351731 is about 495.0875347696.

The spelling of 121351731 in words is "one hundred twenty-one million, three hundred fifty-one thousand, seven hundred thirty-one".