121291567 has 2 divisors, whose sum is σ = 121291568. Its totient is φ = 121291566.

The previous prime is 121291553. The next prime is 121291579. The reversal of 121291567 is 765192121.

It is a strong prime.

It is an emirp because it is prime and its reverse (765192121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121291567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121291267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60645783 + 60645784.

It is an arithmetic number, because the mean of its divisors is an integer number (60645784).

Almost surely, 2^121291567 is an apocalyptic number.

121291567 is the 6359-th hex number.

121291567 is a deficient number, since it is larger than the sum of its proper divisors (1).

121291567 is an equidigital number, since it uses as much as digits as its factorization.

121291567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 34.

The square root of 121291567 is about 11013.2450712767. The cubic root of 121291567 is about 495.0057027537.

The spelling of 121291567 in words is "one hundred twenty-one million, two hundred ninety-one thousand, five hundred sixty-seven".