121761019 has 2 divisors, whose sum is σ = 121761020. Its totient is φ = 121761018.

The previous prime is 121760999. The next prime is 121761023. The reversal of 121761019 is 910167121.

It is a strong prime.

It is an emirp because it is prime and its reverse (910167121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121761019 - 2¹⁵ = 121728251 is a prime.

It is a super-2 number, since 2×121761019² = 29651491495836722, which contains 22 as substring.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (121761119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60880509 + 60880510.

It is an arithmetic number, because the mean of its divisors is an integer number (60880510).

Almost surely, 2^121761019 is an apocalyptic number.

121761019 is a deficient number, since it is larger than the sum of its proper divisors (1).

121761019 is an equidigital number, since it uses as much as digits as its factorization.

121761019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 28.

The square root of 121761019 is about 11034.5375526118. The cubic root of 121761019 is about 495.6435109148.

The spelling of 121761019 in words is "one hundred twenty-one million, seven hundred sixty-one thousand, nineteen".