917971994 has 4 divisors (see below), whose sum is σ = 1376957994. Its totient is φ = 458985996.

The previous prime is 917971991. The next prime is 917971997. The reversal of 917971994 is 499179719.

It is a happy number.

917971994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (917971991) and next prime (917971997).

It can be written as a sum of positive squares in only one way, i.e., 681888769 + 236083225 = 26113^2 + 15365^2 .

It is not an unprimeable number, because it can be changed into a prime (917971991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 229492997 + ... + 229493000.

Almost surely, 2^917971994 is an apocalyptic number.

917971994 is a deficient number, since it is larger than the sum of its proper divisors (458986000).

917971994 is a wasteful number, since it uses less digits than its factorization.

917971994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458985999.

The product of its digits is 1285956, while the sum is 56.

The square root of 917971994 is about 30298.0526436931. The cubic root of 917971994 is about 971.8736569965.

The spelling of 917971994 in words is "nine hundred seventeen million, nine hundred seventy-one thousand, nine hundred ninety-four".