121771361531 has 2 divisors, whose sum is σ = 121771361532. Its totient is φ = 121771361530.

The previous prime is 121771361497. The next prime is 121771361557. The reversal of 121771361531 is 135163177121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121771361531 - 2¹⁰ = 121771360507 is a prime.

It is a super-2 number, since 2×121771361531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121771361561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60885680765 + 60885680766.

It is an arithmetic number, because the mean of its divisors is an integer number (60885680766).

Almost surely, 2^121771361531 is an apocalyptic number.

121771361531 is a deficient number, since it is larger than the sum of its proper divisors (1).

121771361531 is an equidigital number, since it uses as much as digits as its factorization.

121771361531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 38.

The spelling of 121771361531 in words is "one hundred twenty-one billion, seven hundred seventy-one million, three hundred sixty-one thousand, five hundred thirty-one".