1974849521 has 2 divisors, whose sum is σ = 1974849522. Its totient is φ = 1974849520.

The previous prime is 1974849491. The next prime is 1974849577. The reversal of 1974849521 is 1259484791.

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., 1527949921 + 446899600 = 39089^2 + 21140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1974849521 - 2¹⁰ = 1974848497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1974849521.

It is not a weakly prime, because it can be changed into another prime (1974842521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987424760 + 987424761.

It is an arithmetic number, because the mean of its divisors is an integer number (987424761).

Almost surely, 2^1974849521 is an apocalyptic number.

It is an amenable number.

1974849521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974849521 is an equidigital number, since it uses as much as digits as its factorization.

1974849521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 50.

The square root of 1974849521 is about 44439.2790333057. The cubic root of 1974849521 is about 1254.6174865318.

The spelling of 1974849521 in words is "one billion, nine hundred seventy-four million, eight hundred forty-nine thousand, five hundred twenty-one".