991242534 has 16 divisors (see below), whose sum is σ = 1983407472. Its totient is φ = 330260448.

The previous prime is 991242509. The next prime is 991242541. The reversal of 991242534 is 435242199.

It is a super-2 number, since 2×991242534² = 1965123522421482312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 991242492 and 991242501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24049 + ... + 50604.

It is an arithmetic number, because the mean of its divisors is an integer number (123962967).

Almost surely, 2^991242534 is an apocalyptic number.

991242534 is an abundant number, since it is smaller than the sum of its proper divisors (992164938).

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

991242534 is a wasteful number, since it uses less digits than its factorization.

991242534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76871.

The product of its digits is 77760, while the sum is 39.

The square root of 991242534 is about 31484.0044149406. The cubic root of 991242534 is about 997.0722814960.

The spelling of 991242534 in words is "nine hundred ninety-one million, two hundred forty-two thousand, five hundred thirty-four".