9919451506 has 4 divisors (see below), whose sum is σ = 14879177262. Its totient is φ = 4959725752.

The previous prime is 9919451501. The next prime is 9919451527. The reversal of 9919451506 is 6051549199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6051549199 = 313 ⋅19334023.

It can be written as a sum of positive squares in only one way, i.e., 9397557481 + 521894025 = 96941^2 + 22845^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9919451506.

It is not an unprimeable number, because it can be changed into a prime (9919451501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2479862875 + ... + 2479862878.

Almost surely, 2^9919451506 is an apocalyptic number.

9919451506 is a deficient number, since it is larger than the sum of its proper divisors (4959725756).

9919451506 is a wasteful number, since it uses less digits than its factorization.

9919451506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4959725755.

The product of its (nonzero) digits is 437400, while the sum is 49.

The square root of 9919451506 is about 99596.4432397061. The cubic root of 9919451506 is about 2148.6345399418.

The spelling of 9919451506 in words is "nine billion, nine hundred nineteen million, four hundred fifty-one thousand, five hundred six".