100121977 has 2 divisors, whose sum is σ = 100121978. Its totient is φ = 100121976.

The previous prime is 100121969. The next prime is 100121981. The reversal of 100121977 is 779121001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92371321 + 7750656 = 9611^2 + 2784^2 .

It is an emirp because it is prime and its reverse (779121001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100121977 - 2³ = 100121969 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100121947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060988 + 50060989.

It is an arithmetic number, because the mean of its divisors is an integer number (50060989).

Almost surely, 2^100121977 is an apocalyptic number.

It is an amenable number.

100121977 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121977 is an equidigital number, since it uses as much as digits as its factorization.

100121977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 100121977 is about 10006.0969913348. The cubic root of 100121977 is about 464.3475290410.

Adding to 100121977 its reverse (779121001), we get a palindrome (879242978).

The spelling of 100121977 in words is "one hundred million, one hundred twenty-one thousand, nine hundred seventy-seven".