121541155787 has 2 divisors, whose sum is σ = 121541155788. Its totient is φ = 121541155786.

The previous prime is 121541155759. The next prime is 121541155793. The reversal of 121541155787 is 787551145121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121541155787 - 2¹⁴ = 121541139403 is a prime.

It is not a weakly prime, because it can be changed into another prime (121541155387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60770577893 + 60770577894.

It is an arithmetic number, because the mean of its divisors is an integer number (60770577894).

Almost surely, 2^121541155787 is an apocalyptic number.

121541155787 is a deficient number, since it is larger than the sum of its proper divisors (1).

121541155787 is an equidigital number, since it uses as much as digits as its factorization.

121541155787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 392000, while the sum is 47.

The spelling of 121541155787 in words is "one hundred twenty-one billion, five hundred forty-one million, one hundred fifty-five thousand, seven hundred eighty-seven".