121231507 has 2 divisors, whose sum is σ = 121231508. Its totient is φ = 121231506.

The previous prime is 121231501. The next prime is 121231553. The reversal of 121231507 is 705132121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121231507 - 2⁷ = 121231379 is a prime.

It is not a weakly prime, because it can be changed into another prime (121231501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60615753 + 60615754.

It is an arithmetic number, because the mean of its divisors is an integer number (60615754).

Almost surely, 2^121231507 is an apocalyptic number.

121231507 is a deficient number, since it is larger than the sum of its proper divisors (1).

121231507 is an equidigital number, since it uses as much as digits as its factorization.

121231507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 121231507 is about 11010.5180168782. The cubic root of 121231507 is about 494.9239851984.

Adding to 121231507 its reverse (705132121), we get a palindrome (826363628).

The spelling of 121231507 in words is "one hundred twenty-one million, two hundred thirty-one thousand, five hundred seven".