1061977985 has 4 divisors (see below), whose sum is σ = 1274373588. Its totient is φ = 849582384.

The previous prime is 1061977951. The next prime is 1061978051. The reversal of 1061977985 is 5897791601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 667240561 + 394737424 = 25831^2 + 19868^2 .

It is a cyclic number.

It is not a de Polignac number, because 1061977985 - 2⁶ = 1061977921 is a prime.

It is a super-2 number, since 2×1061977985² = 2255594481249320450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106197794 + ... + 106197803.

It is an arithmetic number, because the mean of its divisors is an integer number (318593397).

Almost surely, 2^1061977985 is an apocalyptic number.

It is an amenable number.

1061977985 is a deficient number, since it is larger than the sum of its proper divisors (212395603).

1061977985 is an equidigital number, since it uses as much as digits as its factorization.

1061977985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212395602.

The product of its (nonzero) digits is 952560, while the sum is 53.

The square root of 1061977985 is about 32588.0036976799. The cubic root of 1061977985 is about 1020.2466355402.

The spelling of 1061977985 in words is "one billion, sixty-one million, nine hundred seventy-seven thousand, nine hundred eighty-five".