121571531 has 2 divisors, whose sum is σ = 121571532. Its totient is φ = 121571530.

The previous prime is 121571503. The next prime is 121571543. The reversal of 121571531 is 135175121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121571531 - 2¹⁸ = 121309387 is a prime.

It is a super-2 number, since 2×121571531² = 29559274299367922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121571531.

It is not a weakly prime, because it can be changed into another prime (121571501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60785765 + 60785766.

It is an arithmetic number, because the mean of its divisors is an integer number (60785766).

Almost surely, 2^121571531 is an apocalyptic number.

121571531 is a deficient number, since it is larger than the sum of its proper divisors (1).

121571531 is an equidigital number, since it uses as much as digits as its factorization.

121571531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1050, while the sum is 26.

The square root of 121571531 is about 11025.9480771496. The cubic root of 121571531 is about 495.3862658619.

The spelling of 121571531 in words is "one hundred twenty-one million, five hundred seventy-one thousand, five hundred thirty-one".