31641149 has 4 divisors (see below), whose sum is σ = 31663836. Its totient is φ = 31618464.

The previous prime is 31641143. The next prime is 31641157. The reversal of 31641149 is 94114613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94114613 = 83 ⋅1133911.

It can be written as a sum of positive squares in 2 ways, for example, as 12996025 + 18645124 = 3605^2 + 4318^2 .

It is a cyclic number.

It is not a de Polignac number, because 31641149 - 2⁴ = 31641133 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 (31641143) 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, 9104 + ... + 12089.

It is an arithmetic number, because the mean of its divisors is an integer number (7915959).

Almost surely, 2^31641149 is an apocalyptic number.

It is an amenable number.

31641149 is a deficient number, since it is larger than the sum of its proper divisors (22687).

31641149 is a wasteful number, since it uses less digits than its factorization.

31641149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22686.

The product of its digits is 2592, while the sum is 29.

The square root of 31641149 is about 5625.0465775849. The cubic root of 31641149 is about 316.2889954883.

The spelling of 31641149 in words is "thirty-one million, six hundred forty-one thousand, one hundred forty-nine".