991554094 has 4 divisors (see below), whose sum is σ = 1487331144. Its totient is φ = 495777046.

The previous prime is 991554061. The next prime is 991554097. The reversal of 991554094 is 490455199.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991554097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247888522 + ... + 247888525.

It is an arithmetic number, because the mean of its divisors is an integer number (371832786).

Almost surely, 2^991554094 is an apocalyptic number.

991554094 is a deficient number, since it is larger than the sum of its proper divisors (495777050).

991554094 is a wasteful number, since it uses less digits than its factorization.

991554094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495777049.

The product of its (nonzero) digits is 291600, while the sum is 46.

The square root of 991554094 is about 31488.9519355599. The cubic root of 991554094 is about 997.1767346742.

It can be divided in two parts, 9915 and 54094, that added together give a square (64009 = 253²).

The spelling of 991554094 in words is "nine hundred ninety-one million, five hundred fifty-four thousand, ninety-four".