101020171949 has 2 divisors, whose sum is σ = 101020171950. Its totient is φ = 101020171948.

The previous prime is 101020171939. The next prime is 101020171951. The reversal of 101020171949 is 949171020101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85901748100 + 15118423849 = 293090^2 + 122957^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101020171949 is a prime.

Together with 101020171951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101020171939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50510085974 + 50510085975.

It is an arithmetic number, because the mean of its divisors is an integer number (50510085975).

Almost surely, 2^101020171949 is an apocalyptic number.

It is an amenable number.

101020171949 is a deficient number, since it is larger than the sum of its proper divisors (1).

101020171949 is an equidigital number, since it uses as much as digits as its factorization.

101020171949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 35.

The spelling of 101020171949 in words is "one hundred one billion, twenty million, one hundred seventy-one thousand, nine hundred forty-nine".