1601963961 has 16 divisors (see below), whose sum is σ = 2400268416. Its totient is φ = 942961536.

The previous prime is 1601963939. The next prime is 1601963969. The reversal of 1601963961 is 1693691061.

It is not a de Polignac number, because 1601963961 - 2⁷ = 1601963833 is a prime.

It is a super-3 number, since 3×1601963961³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1601963969) 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, 892060 + ... + 893853.

It is an arithmetic number, because the mean of its divisors is an integer number (150016776).

Almost surely, 2^1601963961 is an apocalyptic number.

It is an amenable number.

1601963961 is a deficient number, since it is larger than the sum of its proper divisors (798304455).

1601963961 is a wasteful number, since it uses less digits than its factorization.

1601963961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785952.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 1601963961 is about 40024.5419836380. The cubic root of 1601963961 is about 1170.0854543472.

The spelling of 1601963961 in words is "one billion, six hundred one million, nine hundred sixty-three thousand, nine hundred sixty-one".