1219487919561 has 16 divisors (see below), whose sum is σ = 1832094529920. Its totient is φ = 801541354320.

The previous prime is 1219487919527. The next prime is 1219487919563. The reversal of 1219487919561 is 1659197849121.

1219487919561 is a `hidden beast` number, since 1 + 2 + 1 + 9 + 487 + 9 + 1 + 95 + 61 = 666.

It is not a de Polignac number, because 1219487919561 - 2¹¹ = 1219487917513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1219487919563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318070050 + ... + 318073883.

It is an arithmetic number, because the mean of its divisors is an integer number (114505908120).

Almost surely, 2^{1219487919561} is an apocalyptic number.

It is an amenable number.

1219487919561 is a deficient number, since it is larger than the sum of its proper divisors (612606610359).

1219487919561 is an equidigital number, since it uses as much as digits as its factorization.

1219487919561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636144013 (or 636144007 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 63.

The spelling of 1219487919561 in words is "one trillion, two hundred nineteen billion, four hundred eighty-seven million, nine hundred nineteen thousand, five hundred sixty-one".