1055499991 has 16 divisors (see below), whose sum is σ = 1299884544. Its totient is φ = 834601824.

The previous prime is 1055499983. The next prime is 1055500007. The reversal of 1055499991 is 1999945501.

It is a happy number.

It is not a de Polignac number, because 1055499991 - 2³ = 1055499983 is a prime.

It is a super-2 number, since 2×1055499991² = 2228160462002000162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055499901) 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, 218100 + ... + 222886.

It is an arithmetic number, because the mean of its divisors is an integer number (81242784).

Almost surely, 2^1055499991 is an apocalyptic number.

1055499991 is a deficient number, since it is larger than the sum of its proper divisors (244384553).

1055499991 is a wasteful number, since it uses less digits than its factorization.

1055499991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7230.

The product of its (nonzero) digits is 656100, while the sum is 52.

The square root of 1055499991 is about 32488.4593509757. The cubic root of 1055499991 is about 1018.1679245990.

The spelling of 1055499991 in words is "one billion, fifty-five million, four hundred ninety-nine thousand, nine hundred ninety-one".