991511412 has 24 divisors (see below), whose sum is σ = 2315440512. Its totient is φ = 330230400.

The previous prime is 991511407. The next prime is 991511413. The reversal of 991511412 is 214115199.

991511412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991511413) 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, 18789 + ... + 48332.

It is an arithmetic number, because the mean of its divisors is an integer number (96476688).

Almost surely, 2^991511412 is an apocalyptic number.

It is an amenable number.

991511412 is an abundant number, since it is smaller than the sum of its proper divisors (1323929100).

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

991511412 is a wasteful number, since it uses less digits than its factorization.

991511412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68359 (or 68357 counting only the distinct ones).

The product of its digits is 3240, while the sum is 33.

The square root of 991511412 is about 31488.2741985013. The cubic root of 991511412 is about 997.1624264589.

The spelling of 991511412 in words is "nine hundred ninety-one million, five hundred eleven thousand, four hundred twelve".