121243631 has 4 divisors (see below), whose sum is σ = 121300632. Its totient is φ = 121186632.

The previous prime is 121243627. The next prime is 121243657. The reversal of 121243631 is 136342121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136342121 = 43 ⋅3170747.

It is a cyclic number.

It is not a de Polignac number, because 121243631 - 2² = 121243627 is a prime.

It is a super-2 number, since 2×121243631² = 29400036116128322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121243597 and 121243606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121243621) 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 3 ways as a sum of consecutive naturals, for example, 25181 + ... + 29606.

It is an arithmetic number, because the mean of its divisors is an integer number (30325158).

Almost surely, 2^121243631 is an apocalyptic number.

121243631 is a deficient number, since it is larger than the sum of its proper divisors (57001).

121243631 is an equidigital number, since it uses as much as digits as its factorization.

121243631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57000.

The product of its digits is 864, while the sum is 23.

The square root of 121243631 is about 11011.0685675823. The cubic root of 121243631 is about 494.9404832704.

Adding to 121243631 its reverse (136342121), we get a palindrome (257585752).

The spelling of 121243631 in words is "one hundred twenty-one million, two hundred forty-three thousand, six hundred thirty-one".