31742069 has 4 divisors (see below), whose sum is σ = 31753920. Its totient is φ = 31730220.

The previous prime is 31742023. The next prime is 31742083. The reversal of 31742069 is 96024713.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31742069 is a prime.

It is a super-2 number, since 2×31742069² = 2015117888801522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31742089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212 + ... + 7970.

It is an arithmetic number, because the mean of its divisors is an integer number (7938480).

Almost surely, 2^31742069 is an apocalyptic number.

It is an amenable number.

31742069 is a deficient number, since it is larger than the sum of its proper divisors (11851).

31742069 is an equidigital number, since it uses as much as digits as its factorization.

31742069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11850.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 31742069 is about 5634.0100283901. The cubic root of 31742069 is about 316.6249083748.

The spelling of 31742069 in words is "thirty-one million, seven hundred forty-two thousand, sixty-nine".