121771619 has 2 divisors, whose sum is σ = 121771620. Its totient is φ = 121771618.

The previous prime is 121771597. The next prime is 121771649. The reversal of 121771619 is 916177121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121771619 - 2¹⁶ = 121706083 is a prime.

It is a super-2 number, since 2×121771619² = 29656654387762322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121771649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60885809 + 60885810.

It is an arithmetic number, because the mean of its divisors is an integer number (60885810).

Almost surely, 2^121771619 is an apocalyptic number.

121771619 is a deficient number, since it is larger than the sum of its proper divisors (1).

121771619 is an equidigital number, since it uses as much as digits as its factorization.

121771619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 35.

The square root of 121771619 is about 11035.0178522737. The cubic root of 121771619 is about 495.6578933742.

The spelling of 121771619 in words is "one hundred twenty-one million, seven hundred seventy-one thousand, six hundred nineteen".