1979522749 has 2 divisors, whose sum is σ = 1979522750. Its totient is φ = 1979522748.

The previous prime is 1979522729. The next prime is 1979522801. The reversal of 1979522749 is 9472259791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1362348100 + 617174649 = 36910^2 + 24843^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979522749 - 2⁵ = 1979522717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1979522749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1979522719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989761374 + 989761375.

It is an arithmetic number, because the mean of its divisors is an integer number (989761375).

Almost surely, 2^1979522749 is an apocalyptic number.

It is an amenable number.

1979522749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979522749 is an equidigital number, since it uses as much as digits as its factorization.

1979522749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 55.

The square root of 1979522749 is about 44491.8278900744. The cubic root of 1979522749 is about 1255.6063373795.

The spelling of 1979522749 in words is "one billion, nine hundred seventy-nine million, five hundred twenty-two thousand, seven hundred forty-nine".