31342109 has 4 divisors (see below), whose sum is σ = 31501404. Its totient is φ = 31182816.

The previous prime is 31342097. The next prime is 31342121. The reversal of 31342109 is 90124313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90124313 = 67 ⋅1345139.

It is an interprime number because it is at equal distance from previous prime (31342097) and next prime (31342121).

It can be written as a sum of positive squares in 2 ways, for example, as 15382084 + 15960025 = 3922^2 + 3995^2 .

It is a cyclic number.

It is not a de Polignac number, because 31342109 - 2⁴ = 31342093 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 (31342139) 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, 79352 + ... + 79745.

It is an arithmetic number, because the mean of its divisors is an integer number (7875351).

Almost surely, 2^31342109 is an apocalyptic number.

It is an amenable number.

31342109 is a deficient number, since it is larger than the sum of its proper divisors (159295).

31342109 is a wasteful number, since it uses less digits than its factorization.

31342109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159294.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31342109 is about 5598.4023613885. The cubic root of 31342109 is about 315.2894257686.

The spelling of 31342109 in words is "thirty-one million, three hundred forty-two thousand, one hundred nine".