1055619891 has 16 divisors (see below), whose sum is σ = 1631877120. Its totient is φ = 673148520.

The previous prime is 1055619889. The next prime is 1055619899. The reversal of 1055619891 is 1989165501.

1055619891 is a `hidden beast` number, since 1 + 0 + 5 + 561 + 9 + 89 + 1 = 666.

It is not a de Polignac number, because 1055619891 - 2¹ = 1055619889 is a prime.

It is a super-2 number, since 2×1055619891² = 2228666708549703762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1055619899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 849315 + ... + 850556.

It is an arithmetic number, because the mean of its divisors is an integer number (101992320).

Almost surely, 2^1055619891 is an apocalyptic number.

1055619891 is a deficient number, since it is larger than the sum of its proper divisors (576257229).

1055619891 is a wasteful number, since it uses less digits than its factorization.

1055619891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699903 (or 1699897 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 45.

The square root of 1055619891 is about 32490.3045692096. The cubic root of 1055619891 is about 1018.2064762216.

The spelling of 1055619891 in words is "one billion, fifty-five million, six hundred nineteen thousand, eight hundred ninety-one".