1961592138409 has 8 divisors (see below), whose sum is σ = 2029252815360. Its totient is φ = 1893932766096.

The previous prime is 1961592138347. The next prime is 1961592138439. The reversal of 1961592138409 is 9048312951691.

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 1961592138409 - 2²⁹ = 1961055267497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961592138439) 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, 3489592 + ... + 4012534.

It is an arithmetic number, because the mean of its divisors is an integer number (253656601920).

Almost surely, 2^{1961592138409} is an apocalyptic number.

It is an amenable number.

1961592138409 is a deficient number, since it is larger than the sum of its proper divisors (67660676951).

1961592138409 is a wasteful number, since it uses less digits than its factorization.

1961592138409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652319.

The product of its (nonzero) digits is 4199040, while the sum is 58.

The spelling of 1961592138409 in words is "one trillion, nine hundred sixty-one billion, five hundred ninety-two million, one hundred thirty-eight thousand, four hundred nine".