1961335901 has 16 divisors (see below), whose sum is σ = 2298051840. Its totient is φ = 1638817920.

The previous prime is 1961335891. The next prime is 1961335903. The reversal of 1961335901 is 1095331691.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961335901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961335903) 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 15 ways as a sum of consecutive naturals, for example, 537455 + ... + 541091.

It is an arithmetic number, because the mean of its divisors is an integer number (143628240).

Almost surely, 2^1961335901 is an apocalyptic number.

It is an amenable number.

1961335901 is a deficient number, since it is larger than the sum of its proper divisors (336715939).

1961335901 is a wasteful number, since it uses less digits than its factorization.

1961335901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5564.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 1961335901 is about 44286.9721362841. The cubic root of 1961335901 is about 1251.7492099499.

The spelling of 1961335901 in words is "one billion, nine hundred sixty-one million, three hundred thirty-five thousand, nine hundred one".