1371721049 has 2 divisors, whose sum is σ = 1371721050. Its totient is φ = 1371721048.

The previous prime is 1371721009. The next prime is 1371721063. The reversal of 1371721049 is 9401271731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1361093449 + 10627600 = 36893^2 + 3260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1371721049 - 2¹² = 1371716953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1371721009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685860524 + 685860525.

It is an arithmetic number, because the mean of its divisors is an integer number (685860525).

Almost surely, 2^1371721049 is an apocalyptic number.

It is an amenable number.

1371721049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371721049 is an equidigital number, since it uses as much as digits as its factorization.

1371721049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 1371721049 is about 37036.7526789269. The cubic root of 1371721049 is about 1111.1054239416.

The spelling of 1371721049 in words is "one billion, three hundred seventy-one million, seven hundred twenty-one thousand, forty-nine".