1961091268 has 6 divisors (see below), whose sum is σ = 3431909726. Its totient is φ = 980545632.

The previous prime is 1961091259. The next prime is 1961091269. The reversal of 1961091268 is 8621901691.

It can be written as a sum of positive squares in only one way, i.e., 1573867584 + 387223684 = 39672^2 + 19678^2 .

It is a super-2 number, since 2×1961091268² = 7691757922851695648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1961091269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245136405 + ... + 245136412.

Almost surely, 2^1961091268 is an apocalyptic number.

It is an amenable number.

1961091268 is a deficient number, since it is larger than the sum of its proper divisors (1470818458).

1961091268 is a wasteful number, since it uses less digits than its factorization.

1961091268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490272821 (or 490272819 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 1961091268 is about 44284.2101431199. The cubic root of 1961091268 is about 1251.6971651681.

The spelling of 1961091268 in words is "one billion, nine hundred sixty-one million, ninety-one thousand, two hundred sixty-eight".