1930406561 has 4 divisors (see below), whose sum is σ = 1932183552. Its totient is φ = 1928629572.

The previous prime is 1930406507. The next prime is 1930406573. The reversal of 1930406561 is 1656040391.

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 1930406561 - 2¹⁰ = 1930405537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1930466561) 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, 886865 + ... + 889038.

It is an arithmetic number, because the mean of its divisors is an integer number (483045888).

Almost surely, 2^1930406561 is an apocalyptic number.

It is an amenable number.

1930406561 is a deficient number, since it is larger than the sum of its proper divisors (1776991).

1930406561 is a wasteful number, since it uses less digits than its factorization.

1930406561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776990.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1930406561 is about 43936.3922164759. The cubic root of 1930406561 is about 1245.1344856685.

The spelling of 1930406561 in words is "one billion, nine hundred thirty million, four hundred six thousand, five hundred sixty-one".