1961089589491 has 8 divisors (see below), whose sum is σ = 1990383212480. Its totient is φ = 1931796661608.

The previous prime is 1961089589489. The next prime is 1961089589527. The reversal of 1961089589491 is 1949859801691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1961089589491 - 2¹ = 1961089589489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1961089589491.

It is not an unprimeable number, because it can be changed into a prime (1961089589471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9510280 + ... + 9714298.

It is an arithmetic number, because the mean of its divisors is an integer number (248797901560).

Almost surely, 2^{1961089589491} is an apocalyptic number.

1961089589491 is a deficient number, since it is larger than the sum of its proper divisors (29293622989).

1961089589491 is a wasteful number, since it uses less digits than its factorization.

1961089589491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347553.

The product of its (nonzero) digits is 50388480, while the sum is 70.

The spelling of 1961089589491 in words is "one trillion, nine hundred sixty-one billion, eighty-nine million, five hundred eighty-nine thousand, four hundred ninety-one".