1055522391 has 32 divisors (see below), whose sum is σ = 1767495168. Its totient is φ = 544304640.

The previous prime is 1055522383. The next prime is 1055522393. The reversal of 1055522391 is 1932255501.

It is not a de Polignac number, because 1055522391 - 2³ = 1055522383 is a prime.

It is a super-2 number, since 2×1055522391² = 2228255035804713762, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055522393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14971 + ... + 48323.

It is an arithmetic number, because the mean of its divisors is an integer number (55234224).

Almost surely, 2^1055522391 is an apocalyptic number.

1055522391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1055522391 is a deficient number, since it is larger than the sum of its proper divisors (711972777).

1055522391 is a wasteful number, since it uses less digits than its factorization.

1055522391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33511.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 1055522391 is about 32488.8040869466. The cubic root of 1055522391 is about 1018.1751271256.

Adding to 1055522391 its reverse (1932255501), we get a palindrome (2987777892).

The spelling of 1055522391 in words is "one billion, fifty-five million, five hundred twenty-two thousand, three hundred ninety-one".