121317551 has 2 divisors, whose sum is σ = 121317552. Its totient is φ = 121317550.

The previous prime is 121317541. The next prime is 121317557. The reversal of 121317551 is 155713121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121317551 - 2²² = 117123247 is a 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 121317551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121317557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60658775 + 60658776.

It is an arithmetic number, because the mean of its divisors is an integer number (60658776).

Almost surely, 2^121317551 is an apocalyptic number.

121317551 is a deficient number, since it is larger than the sum of its proper divisors (1).

121317551 is an equidigital number, since it uses as much as digits as its factorization.

121317551 is an evil number, because the sum of its binary digits is even.

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

The square root of 121317551 is about 11014.4246785749. The cubic root of 121317551 is about 495.0410481893.

The spelling of 121317551 in words is "one hundred twenty-one million, three hundred seventeen thousand, five hundred fifty-one".