121631579 has 2 divisors, whose sum is σ = 121631580. Its totient is φ = 121631578.

The previous prime is 121631527. The next prime is 121631581. The reversal of 121631579 is 975136121.

It is a strong prime.

It is an emirp because it is prime and its reverse (975136121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121631579 - 2¹² = 121627483 is a prime.

Together with 121631581, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121631519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60815789 + 60815790.

It is an arithmetic number, because the mean of its divisors is an integer number (60815790).

Almost surely, 2^121631579 is an apocalyptic number.

121631579 is a deficient number, since it is larger than the sum of its proper divisors (1).

121631579 is an equidigital number, since it uses as much as digits as its factorization.

121631579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 35.

The square root of 121631579 is about 11028.6707721284. The cubic root of 121631579 is about 495.4678147189.

The spelling of 121631579 in words is "one hundred twenty-one million, six hundred thirty-one thousand, five hundred seventy-nine".