1549971013 has 2 divisors, whose sum is σ = 1549971014. Its totient is φ = 1549971012.

The previous prime is 1549970987. The next prime is 1549971019. The reversal of 1549971013 is 3101799451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 879834244 + 670136769 = 29662^2 + 25887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1549971013 is a prime.

It is a super-2 number, since 2×1549971013² = 4804820282280492338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1549971019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774985506 + 774985507.

It is an arithmetic number, because the mean of its divisors is an integer number (774985507).

Almost surely, 2^1549971013 is an apocalyptic number.

It is an amenable number.

1549971013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1549971013 is an equidigital number, since it uses as much as digits as its factorization.

1549971013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 1549971013 is about 39369.6712330698. The cubic root of 1549971013 is about 1157.2873129177.

The spelling of 1549971013 in words is "one billion, five hundred forty-nine million, nine hundred seventy-one thousand, thirteen".