991148038 has 4 divisors (see below), whose sum is σ = 1486722060. Its totient is φ = 495574018.

The previous prime is 991148033. The next prime is 991148077. The reversal of 991148038 is 830841199.

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

It is a junction number, because it is equal to n+sod(n) for n = 991147985 and 991148003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991148033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247787008 + ... + 247787011.

It is an arithmetic number, because the mean of its divisors is an integer number (371680515).

Almost surely, 2^991148038 is an apocalyptic number.

991148038 is a deficient number, since it is larger than the sum of its proper divisors (495574022).

991148038 is a wasteful number, since it uses less digits than its factorization.

991148038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495574021.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 991148038 is about 31482.5036806160. The cubic root of 991148038 is about 997.0405965709.

The spelling of 991148038 in words is "nine hundred ninety-one million, one hundred forty-eight thousand, thirty-eight".