919987249 has 8 divisors (see below), whose sum is σ = 974562408. Its totient is φ = 865463040.

The previous prime is 919987247. The next prime is 919987261. The reversal of 919987249 is 942789919.

It can be written as a sum of positive squares in 4 ways, for example, as 51624225 + 868363024 = 7185^2 + 29468^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 919987249 - 2¹ = 919987247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 919987193 and 919987202.

It is not an unprimeable number, because it can be changed into a prime (919987247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28239 + ... + 51355.

It is an arithmetic number, because the mean of its divisors is an integer number (121820301).

Almost surely, 2^919987249 is an apocalyptic number.

It is an amenable number.

919987249 is a deficient number, since it is larger than the sum of its proper divisors (54575159).

919987249 is a wasteful number, since it uses less digits than its factorization.

919987249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25475.

The product of its digits is 2939328, while the sum is 58.

The square root of 919987249 is about 30331.2915814675. The cubic root of 919987249 is about 972.5843329082.

The spelling of 919987249 in words is "nine hundred nineteen million, nine hundred eighty-seven thousand, two hundred forty-nine".