961995887 has 4 divisors (see below), whose sum is σ = 962563800. Its totient is φ = 961427976.

The previous prime is 961995883. The next prime is 961995911. The reversal of 961995887 is 788599169.

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

It is a cyclic number.

It is not a de Polignac number, because 961995887 - 2² = 961995883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961995883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281408 + ... + 284805.

It is an arithmetic number, because the mean of its divisors is an integer number (240640950).

Almost surely, 2^961995887 is an apocalyptic number.

961995887 is a deficient number, since it is larger than the sum of its proper divisors (567913).

961995887 is a wasteful number, since it uses less digits than its factorization.

961995887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567912.

The product of its digits is 9797760, while the sum is 62.

The square root of 961995887 is about 31016.0585342496. The cubic root of 961995887 is about 987.1680065839.

The spelling of 961995887 in words is "nine hundred sixty-one million, nine hundred ninety-five thousand, eight hundred eighty-seven".