991342836 has 54 divisors (see below), whose sum is σ = 2754424946. Its totient is φ = 300405600.

The previous prime is 991342829. The next prime is 991342843. The reversal of 991342836 is 638243199.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (991342829) and next prime (991342843).

It can be written as a sum of positive squares in only one way, i.e., 917726436 + 73616400 = 30294^2 + 8580^2 .

It is a junction number, because it is equal to n+sod(n) for n = 991342791 and 991342800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 109435 + ... + 118146.

Almost surely, 2^991342836 is an apocalyptic number.

It is an amenable number.

991342836 is an abundant number, since it is smaller than the sum of its proper divisors (1763082110).

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

991342836 is a wasteful number, since it uses less digits than its factorization.

991342836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227613 (or 227597 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 991342836 is about 31485.5972787559. The cubic root of 991342836 is about 997.1059109956.

The spelling of 991342836 in words is "nine hundred ninety-one million, three hundred forty-two thousand, eight hundred thirty-six".