981699949 has 4 divisors (see below), whose sum is σ = 982215036. Its totient is φ = 981184864.

The previous prime is 981699931. The next prime is 981699989. The reversal of 981699949 is 949996189.

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

It can be written as a sum of positive squares in 2 ways, for example, as 374422500 + 607277449 = 19350^2 + 24643^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981699949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981699919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254674 + ... + 258499.

It is an arithmetic number, because the mean of its divisors is an integer number (245553759).

Almost surely, 2^981699949 is an apocalyptic number.

It is an amenable number.

981699949 is a deficient number, since it is larger than the sum of its proper divisors (515087).

981699949 is a wasteful number, since it uses less digits than its factorization.

981699949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515086.

The product of its digits is 11337408, while the sum is 64.

The square root of 981699949 is about 31332.0913601375. The cubic root of 981699949 is about 993.8623898096.

The spelling of 981699949 in words is "nine hundred eighty-one million, six hundred ninety-nine thousand, nine hundred forty-nine".