121643097431 has 2 divisors, whose sum is σ = 121643097432. Its totient is φ = 121643097430.

The previous prime is 121643097413. The next prime is 121643097437. The reversal of 121643097431 is 134790346121.

Together with previous prime (121643097413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121643097431 is a prime.

It is a super-2 number, since 2×121643097431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121643097437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60821548715 + 60821548716.

It is an arithmetic number, because the mean of its divisors is an integer number (60821548716).

Almost surely, 2^121643097431 is an apocalyptic number.

121643097431 is a deficient number, since it is larger than the sum of its proper divisors (1).

121643097431 is an equidigital number, since it uses as much as digits as its factorization.

121643097431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 121643097431 in words is "one hundred twenty-one billion, six hundred forty-three million, ninety-seven thousand, four hundred thirty-one".