1061261289 has 12 divisors (see below), whose sum is σ = 1672290672. Its totient is φ = 643188600.

The previous prime is 1061261287. The next prime is 1061261297. The reversal of 1061261289 is 9821621601.

1061261289 is a `hidden beast` number, since 10 + 612 + 6 + 1 + 28 + 9 = 666.

It is not a de Polignac number, because 1061261289 - 2¹ = 1061261287 is a prime.

It is a super-2 number, since 2×1061261289² = 2252551047059883042, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1061261287) 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, 5359807 + ... + 5360004.

It is an arithmetic number, because the mean of its divisors is an integer number (139357556).

Almost surely, 2^1061261289 is an apocalyptic number.

It is an amenable number.

1061261289 is a deficient number, since it is larger than the sum of its proper divisors (611029383).

1061261289 is a wasteful number, since it uses less digits than its factorization.

1061261289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10719828 (or 10719825 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1061261289 is about 32577.0055253702. The cubic root of 1061261289 is about 1020.0170729553.

The spelling of 1061261289 in words is "one billion, sixty-one million, two hundred sixty-one thousand, two hundred eighty-nine".