1055661261 has 32 divisors (see below), whose sum is σ = 1517322240. Its totient is φ = 650804544.

The previous prime is 1055661253. The next prime is 1055661283. The reversal of 1055661261 is 1621665501.

It is not a de Polignac number, because 1055661261 - 2³ = 1055661253 is a prime.

It is a super-2 number, since 2×1055661261² = 2228841395952220242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055661241) 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, 672900 + ... + 674466.

It is an arithmetic number, because the mean of its divisors is an integer number (47416320).

Almost surely, 2^1055661261 is an apocalyptic number.

It is an amenable number.

1055661261 is a deficient number, since it is larger than the sum of its proper divisors (461660979).

1055661261 is a wasteful number, since it uses less digits than its factorization.

1055661261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1055661261 is about 32490.9412144370. The cubic root of 1055661261 is about 1018.2197773009.

It can be divided in two parts, 10556 and 61261, that added together give a palindrome (71817).

The spelling of 1055661261 in words is "one billion, fifty-five million, six hundred sixty-one thousand, two hundred sixty-one".