31949 has 4 divisors (see below), whose sum is σ = 32736. Its totient is φ = 31164.

The previous prime is 31907. The next prime is 31957. The reversal of 31949 is 94913.

31949 = T₁₅ + T₁₆ + ... + T₅₇.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31949 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31249) 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, 329 + ... + 414.

It is an arithmetic number, because the mean of its divisors is an integer number (8184).

2³¹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

31949 is a deficient number, since it is larger than the sum of its proper divisors (787).

31949 is an equidigital number, since it uses as much as digits as its factorization.

31949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786.

The product of its digits is 972, while the sum is 26.

The square root of 31949 is about 178.7428320241. The cubic root of 31949 is about 31.7311459351.

The spelling of 31949 in words is "thirty-one thousand, nine hundred forty-nine".