1061821965 has 16 divisors (see below), whose sum is σ = 1699479936. Its totient is φ = 566116800.

The previous prime is 1061821961. The next prime is 1061822009. The reversal of 1061821965 is 5691281601.

It is not a de Polignac number, because 1061821965 - 2² = 1061821961 is a prime.

It is a super-2 number, since 2×1061821965² = 2254931770712922450, 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 (1061821961) 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, 43120 + ... + 63110.

It is an arithmetic number, because the mean of its divisors is an integer number (106217496).

Almost surely, 2^1061821965 is an apocalyptic number.

1061821965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1061821965 is a deficient number, since it is larger than the sum of its proper divisors (637657971).

1061821965 is a wasteful number, since it uses less digits than its factorization.

1061821965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23540.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1061821965 is about 32585.6097840749. The cubic root of 1061821965 is about 1020.1966700738.

The spelling of 1061821965 in words is "one billion, sixty-one million, eight hundred twenty-one thousand, nine hundred sixty-five".