100121969 has 2 divisors, whose sum is σ = 100121970. Its totient is φ = 100121968.

The previous prime is 100121953. The next prime is 100121977. The reversal of 100121969 is 969121001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73753744 + 26368225 = 8588^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 100121969 - 2⁴ = 100121953 is a prime.

It is a super-2 number, since 2×100121969² = 20048817352873922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100121939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060984 + 50060985.

It is an arithmetic number, because the mean of its divisors is an integer number (50060985).

Almost surely, 2^100121969 is an apocalyptic number.

It is an amenable number.

100121969 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121969 is an equidigital number, since it uses as much as digits as its factorization.

100121969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 100121969 is about 10006.0965915786. The cubic root of 100121969 is about 464.3475166735.

The spelling of 100121969 in words is "one hundred million, one hundred twenty-one thousand, nine hundred sixty-nine".