189647931 has 16 divisors (see below), whose sum is σ = 282268800. Its totient is φ = 112264320.

The previous prime is 189647929. The next prime is 189647933. The reversal of 189647931 is 139746981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (189647929) and next prime (189647933).

It is not a de Polignac number, because 189647931 - 2¹ = 189647929 is a prime.

It is a super-2 number, since 2×189647931² = 71932675465161522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189647933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65406 + ... + 68243.

It is an arithmetic number, because the mean of its divisors is an integer number (17641800).

Almost surely, 2^189647931 is an apocalyptic number.

189647931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

189647931 is a deficient number, since it is larger than the sum of its proper divisors (92620869).

189647931 is a wasteful number, since it uses less digits than its factorization.

189647931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133706.

The product of its digits is 326592, while the sum is 48.

The square root of 189647931 is about 13771.2719456120. The cubic root of 189647931 is about 574.5343991413.

The spelling of 189647931 in words is "one hundred eighty-nine million, six hundred forty-seven thousand, nine hundred thirty-one".