1319649863521 has 4 divisors (see below), whose sum is σ = 1439618032944. Its totient is φ = 1199681694100.

The previous prime is 1319649863507. The next prime is 1319649863527. The reversal of 1319649863521 is 1253689469131.

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 1319649863521 - 2⁹ = 1319649863009 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1319649863527) 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, 59984084695 + ... + 59984084716.

It is an arithmetic number, because the mean of its divisors is an integer number (359904508236).

Almost surely, 2^{1319649863521} is an apocalyptic number.

1319649863521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1319649863521 is a deficient number, since it is larger than the sum of its proper divisors (119968169423).

1319649863521 is a wasteful number, since it uses less digits than its factorization.

1319649863521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119968169422.

The product of its digits is 8398080, while the sum is 58.

The spelling of 1319649863521 in words is "one trillion, three hundred nineteen billion, six hundred forty-nine million, eight hundred sixty-three thousand, five hundred twenty-one".