121550831 has 2 divisors, whose sum is σ = 121550832. Its totient is φ = 121550830.

The previous prime is 121550827. The next prime is 121550917. The reversal of 121550831 is 138055121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121550831 - 2² = 121550827 is a prime.

It is a super-2 number, since 2×121550831² = 29549209033581122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121550831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121550801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60775415 + 60775416.

It is an arithmetic number, because the mean of its divisors is an integer number (60775416).

Almost surely, 2^121550831 is an apocalyptic number.

121550831 is a deficient number, since it is larger than the sum of its proper divisors (1).

121550831 is an equidigital number, since it uses as much as digits as its factorization.

121550831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 121550831 is about 11025.0093423997. The cubic root of 121550831 is about 495.3581477718.

The spelling of 121550831 in words is "one hundred twenty-one million, five hundred fifty thousand, eight hundred thirty-one".