919974949 has 2 divisors, whose sum is σ = 919974950. Its totient is φ = 919974948.

The previous prime is 919974947. The next prime is 919974961. The reversal of 919974949 is 949479919.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 919908900 + 66049 = 30330^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 919974949 - 2¹ = 919974947 is a prime.

Together with 919974947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919974947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459987474 + 459987475.

It is an arithmetic number, because the mean of its divisors is an integer number (459987475).

Almost surely, 2^919974949 is an apocalyptic number.

It is an amenable number.

919974949 is a deficient number, since it is larger than the sum of its proper divisors (1).

919974949 is an equidigital number, since it uses as much as digits as its factorization.

919974949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6613488, while the sum is 61.

The square root of 919974949 is about 30331.0888198891. The cubic root of 919974949 is about 972.5799984856.

It can be divided in two parts, 9199 and 74949, that added together give a palindrome (84148).

The spelling of 919974949 in words is "nine hundred nineteen million, nine hundred seventy-four thousand, nine hundred forty-nine".