986650921 has 9 divisors (see below), whose sum is σ = 999730999. Its totient is φ = 973741000.

The previous prime is 986650901. The next prime is 986650961. The reversal of 986650921 is 129056689.

The square root of 986650921 is 31411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 947962521 + 38688400 = 30789^2 + 6220^2 .

It is not a de Polignac number, because 986650921 - 2⁹ = 986650409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (986650901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3172356 + ... + 3172666.

Almost surely, 2^986650921 is an apocalyptic number.

986650921 is the 31411-st square number.

986650921 is the 15706-th centered octagonal number.

It is an amenable number.

986650921 is a deficient number, since it is larger than the sum of its proper divisors (13080078).

986650921 is an frugal number, since it uses more digits than its factorization.

986650921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The cubic root of 986650921 is about 995.5303590744.

The spelling of 986650921 in words is "nine hundred eighty-six million, six hundred fifty thousand, nine hundred twenty-one".