31961089 has 4 divisors (see below), whose sum is σ = 32254420. Its totient is φ = 31667760.

The previous prime is 31961087. The next prime is 31961107. The reversal of 31961089 is 98016913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98016913 = 67 ⋅1462939.

It can be written as a sum of positive squares in 2 ways, for example, as 24671089 + 7290000 = 4967^2 + 2700^2 .

It is a cyclic number.

It is not a de Polignac number, because 31961089 - 2¹ = 31961087 is a prime.

It is a super-2 number, since 2×31961089² = 2043022420131842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31961087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146502 + ... + 146719.

It is an arithmetic number, because the mean of its divisors is an integer number (8063605).

Almost surely, 2^31961089 is an apocalyptic number.

It is an amenable number.

31961089 is a deficient number, since it is larger than the sum of its proper divisors (293331).

31961089 is a wasteful number, since it uses less digits than its factorization.

31961089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293330.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 31961089 is about 5653.4139243470. The cubic root of 31961089 is about 317.3514761958.

The spelling of 31961089 in words is "thirty-one million, nine hundred sixty-one thousand, eighty-nine".