1591964461 has 4 divisors (see below), whose sum is σ = 1602507424. Its totient is φ = 1581421500.

The previous prime is 1591964459. The next prime is 1591964467. The reversal of 1591964461 is 1644691951.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1644691951 = 7 ⋅234955993.

It is a cyclic number.

It is not a de Polignac number, because 1591964461 - 2¹ = 1591964459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591964467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5271255 + ... + 5271556.

It is an arithmetic number, because the mean of its divisors is an integer number (400626856).

Almost surely, 2^1591964461 is an apocalyptic number.

It is an amenable number.

1591964461 is a deficient number, since it is larger than the sum of its proper divisors (10542963).

1591964461 is a wasteful number, since it uses less digits than its factorization.

1591964461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10542962.

The product of its digits is 233280, while the sum is 46.

The square root of 1591964461 is about 39899.4293317586. The cubic root of 1591964461 is about 1167.6458033894.

The spelling of 1591964461 in words is "one billion, five hundred ninety-one million, nine hundred sixty-four thousand, four hundred sixty-one".