1061991379 has 4 divisors (see below), whose sum is σ = 1064208960. Its totient is φ = 1059773800.

The previous prime is 1061991331. The next prime is 1061991431. The reversal of 1061991379 is 9731991601.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1061991379 is a prime.

It is a super-2 number, since 2×1061991379² = 2255651378140643282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1061991779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1108072 + ... + 1109029.

It is an arithmetic number, because the mean of its divisors is an integer number (266052240).

Almost surely, 2^1061991379 is an apocalyptic number.

1061991379 is a deficient number, since it is larger than the sum of its proper divisors (2217581).

1061991379 is an equidigital number, since it uses as much as digits as its factorization.

1061991379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217580.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 1061991379 is about 32588.2092021025. The cubic root of 1061991379 is about 1020.2509247458.

The spelling of 1061991379 in words is "one billion, sixty-one million, nine hundred ninety-one thousand, three hundred seventy-nine".