991887195 has 48 divisors (see below), whose sum is σ = 1724738400. Its totient is φ = 486540288.

The previous prime is 991887179. The next prime is 991887223. The reversal of 991887195 is 591788199.

It is not a de Polignac number, because 991887195 - 2⁴ = 991887179 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 945031 + ... + 946079.

It is an arithmetic number, because the mean of its divisors is an integer number (35932050).

Almost surely, 2^991887195 is an apocalyptic number.

991887195 is a deficient number, since it is larger than the sum of its proper divisors (732851205).

991887195 is a wasteful number, since it uses less digits than its factorization.

991887195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456 (or 1443 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 57.

The square root of 991887195 is about 31494.2406639690. The cubic root of 991887195 is about 997.2883854593.

The spelling of 991887195 in words is "nine hundred ninety-one million, eight hundred eighty-seven thousand, one hundred ninety-five".