991940534 has 32 divisors (see below), whose sum is σ = 1662534720. Its totient is φ = 440721792.

The previous prime is 991940519. The next prime is 991940539. The reversal of 991940534 is 435049199.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991940539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279479 + ... + 283005.

It is an arithmetic number, because the mean of its divisors is an integer number (51954210).

Almost surely, 2^991940534 is an apocalyptic number.

991940534 is a deficient number, since it is larger than the sum of its proper divisors (670594186).

991940534 is a wasteful number, since it uses less digits than its factorization.

991940534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 991940534 is about 31495.0874582053. The cubic root of 991940534 is about 997.3062616223.

The spelling of 991940534 in words is "nine hundred ninety-one million, nine hundred forty thousand, five hundred thirty-four".