1061133661 has 12 divisors (see below), whose sum is σ = 1263088992. Its totient is φ = 888389208.

The previous prime is 1061133653. The next prime is 1061133673. The reversal of 1061133661 is 1663311601.

It is a happy number.

It is not a de Polignac number, because 1061133661 - 2³ = 1061133653 is a prime.

It is a super-2 number, since 2×1061133661² = 2252009293014525842, 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 (1061133611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249705 + ... + 253918.

It is an arithmetic number, because the mean of its divisors is an integer number (105257416).

Almost surely, 2^1061133661 is an apocalyptic number.

It is an amenable number.

1061133661 is a deficient number, since it is larger than the sum of its proper divisors (201955331).

1061133661 is an equidigital number, since it uses as much as digits as its factorization.

1061133661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503680 (or 503673 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1061133661 is about 32575.0466001202. The cubic root of 1061133661 is about 1019.9761820018.

The spelling of 1061133661 in words is "one billion, sixty-one million, one hundred thirty-three thousand, six hundred sixty-one".