1055289991 has 8 divisors (see below), whose sum is σ = 1206362144. Its totient is φ = 904296960.

The previous prime is 1055289973. The next prime is 1055290007. The reversal of 1055289991 is 1999825501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1055289991 - 2¹⁹ = 1054765703 is a prime.

It is a super-2 number, since 2×1055289991² = 2227273930209560162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055287991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12271 + ... + 47551.

It is an arithmetic number, because the mean of its divisors is an integer number (150795268).

Almost surely, 2^1055289991 is an apocalyptic number.

1055289991 is a deficient number, since it is larger than the sum of its proper divisors (151072153).

1055289991 is an equidigital number, since it uses as much as digits as its factorization.

1055289991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39561.

The product of its (nonzero) digits is 291600, while the sum is 49.

The square root of 1055289991 is about 32485.2272733315. The cubic root of 1055289991 is about 1018.1003959562.

The spelling of 1055289991 in words is "one billion, fifty-five million, two hundred eighty-nine thousand, nine hundred ninety-one".