991861419 has 8 divisors (see below), whose sum is σ = 1330126992. Its totient is φ = 657418400.

The previous prime is 991861411. The next prime is 991861421. The reversal of 991861419 is 914168199.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 991861419 - 2³ = 991861411 is a prime.

It is a super-2 number, since 2×991861419² = 1967578149001387122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (991861411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 955032 + ... + 956069.

It is an arithmetic number, because the mean of its divisors is an integer number (166265874).

Almost surely, 2^991861419 is an apocalyptic number.

991861419 is a deficient number, since it is larger than the sum of its proper divisors (338265573).

991861419 is a wasteful number, since it uses less digits than its factorization.

991861419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911277.

The product of its digits is 139968, while the sum is 48.

The square root of 991861419 is about 31493.8314436335. The cubic root of 991861419 is about 997.2797465979.

The spelling of 991861419 in words is "nine hundred ninety-one million, eight hundred sixty-one thousand, four hundred nineteen".