1961421411 has 16 divisors (see below), whose sum is σ = 2640032000. Its totient is φ = 1295271648.

The previous prime is 1961421391. The next prime is 1961421419. The reversal of 1961421411 is 1141241691.

It is not a de Polignac number, because 1961421411 - 2⁵ = 1961421379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961421419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129540 + ... + 143886.

It is an arithmetic number, because the mean of its divisors is an integer number (165002000).

Almost surely, 2^1961421411 is an apocalyptic number.

1961421411 is a deficient number, since it is larger than the sum of its proper divisors (678610589).

1961421411 is a wasteful number, since it uses less digits than its factorization.

1961421411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14778.

The product of its digits is 1728, while the sum is 30.

The square root of 1961421411 is about 44287.9375338252. The cubic root of 1961421411 is about 1251.7674008709.

The spelling of 1961421411 in words is "one billion, nine hundred sixty-one million, four hundred twenty-one thousand, four hundred eleven".