1544979649 has 4 divisors (see below), whose sum is σ = 1550012464. Its totient is φ = 1539946836.

The previous prime is 1544979647. The next prime is 1544979691. The reversal of 1544979649 is 9469794451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1544979649 - 2¹ = 1544979647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1544979593 and 1544979602.

It is not an unprimeable number, because it can be changed into a prime (1544979641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2515947 + ... + 2516560.

It is an arithmetic number, because the mean of its divisors is an integer number (387503116).

Almost surely, 2^1544979649 is an apocalyptic number.

It is an amenable number.

1544979649 is a deficient number, since it is larger than the sum of its proper divisors (5032815).

1544979649 is an equidigital number, since it uses as much as digits as its factorization.

1544979649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5032814.

The product of its digits is 9797760, while the sum is 58.

The square root of 1544979649 is about 39306.2291373772. The cubic root of 1544979649 is about 1156.0437081629.

It can be divided in two parts, 1544979 and 649, that multiplied together give a triangular number (1002691371 = T₄₄₇₈₁).

The spelling of 1544979649 in words is "one billion, five hundred forty-four million, nine hundred seventy-nine thousand, six hundred forty-nine".