1554479749 has 2 divisors, whose sum is σ = 1554479750. Its totient is φ = 1554479748.

The previous prime is 1554479741. The next prime is 1554479791. The reversal of 1554479749 is 9479744551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1338242724 + 216237025 = 36582^2 + 14705^2 .

It is an emirp because it is prime and its reverse (9479744551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1554479749 - 2³ = 1554479741 is a prime.

It is a super-2 number, since 2×1554479749² = 4832814580102206002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1554479749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1554479741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777239874 + 777239875.

It is an arithmetic number, because the mean of its divisors is an integer number (777239875).

Almost surely, 2^1554479749 is an apocalyptic number.

It is an amenable number.

1554479749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1554479749 is an equidigital number, since it uses as much as digits as its factorization.

1554479749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6350400, while the sum is 55.

The square root of 1554479749 is about 39426.8911911655. The cubic root of 1554479749 is about 1158.4083772485.

The spelling of 1554479749 in words is "one billion, five hundred fifty-four million, four hundred seventy-nine thousand, seven hundred forty-nine".