991892286 has 48 divisors (see below), whose sum is σ = 2679401088. Its totient is φ = 257634000.

The previous prime is 991892267. The next prime is 991892287. The reversal of 991892286 is 682298199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991892287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356440 + ... + 359211.

It is an arithmetic number, because the mean of its divisors is an integer number (55820856).

Almost surely, 2^991892286 is an apocalyptic number.

991892286 is an abundant number, since it is smaller than the sum of its proper divisors (1687508802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991892286 is a wasteful number, since it uses less digits than its factorization.

991892286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715677 (or 715674 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 991892286 is about 31494.3214881667. The cubic root of 991892286 is about 997.2900916972.

It can be divided in two parts, 99189 and 2286, that added together give a triangular number (101475 = T₄₅₀).

The spelling of 991892286 in words is "nine hundred ninety-one million, eight hundred ninety-two thousand, two hundred eighty-six".