121775531 has 2 divisors, whose sum is σ = 121775532. Its totient is φ = 121775530.

The previous prime is 121775497. The next prime is 121775551. The reversal of 121775531 is 135577121.

It is a strong prime.

It is an emirp because it is prime and its reverse (135577121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121775531 - 2¹⁰ = 121774507 is a prime.

It is a super-2 number, since 2×121775531² = 29658559900663922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121775551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60887765 + 60887766.

It is an arithmetic number, because the mean of its divisors is an integer number (60887766).

Almost surely, 2^121775531 is an apocalyptic number.

121775531 is a deficient number, since it is larger than the sum of its proper divisors (1).

121775531 is an equidigital number, since it uses as much as digits as its factorization.

121775531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 32.

The square root of 121775531 is about 11035.1951047546. The cubic root of 121775531 is about 495.6632011050.

The spelling of 121775531 in words is "one hundred twenty-one million, seven hundred seventy-five thousand, five hundred thirty-one".