1370172521 has 2 divisors, whose sum is σ = 1370172522. Its totient is φ = 1370172520.

The previous prime is 1370172499. The next prime is 1370172523. The reversal of 1370172521 is 1252710731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784000000 + 586172521 = 28000^2 + 24211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1370172521 - 2²² = 1365978217 is a prime.

It is a Sophie Germain prime.

Together with 1370172523, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1370172523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685086260 + 685086261.

It is an arithmetic number, because the mean of its divisors is an integer number (685086261).

Almost surely, 2^1370172521 is an apocalyptic number.

It is an amenable number.

1370172521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1370172521 is an equidigital number, since it uses as much as digits as its factorization.

1370172521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 1370172521 is about 37015.8414871255. The cubic root of 1370172521 is about 1110.6871596700.

The spelling of 1370172521 in words is "one billion, three hundred seventy million, one hundred seventy-two thousand, five hundred twenty-one".