1913012644 has 27 divisors (see below), whose sum is σ = 3536316651. Its totient is φ = 905376600.

The previous prime is 1913012641. The next prime is 1913012657. The reversal of 1913012644 is 4462103191.

The square root of 1913012644 is 43738.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×1913012644² = 7319234752207741472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1913012641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1661469 + ... + 1662619.

Almost surely, 2^1913012644 is an apocalyptic number.

1913012644 is the 43738-th square number.

It is an amenable number.

1913012644 is a deficient number, since it is larger than the sum of its proper divisors (1623304007).

1913012644 is an equidigital number, since it uses as much as digits as its factorization.

1913012644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The cubic root of 1913012644 is about 1241.3834377481.

Multiplying 1913012644 by its product of nonzero digits (5184), we get a square (9917057546496 = 3149136²).

The spelling of 1913012644 in words is "one billion, nine hundred thirteen million, twelve thousand, six hundred forty-four".