31542143309 has 4 divisors (see below), whose sum is σ = 31922169216. Its totient is φ = 31162117404.

The previous prime is 31542143299. The next prime is 31542143377. The reversal of 31542143309 is 90334124513.

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 not a de Polignac number, because 31542143309 - 2³² = 27247176013 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 (31542140309) 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, 190012829 + ... + 190012994.

It is an arithmetic number, because the mean of its divisors is an integer number (7980542304).

Almost surely, 2^31542143309 is an apocalyptic number.

It is an amenable number.

31542143309 is a deficient number, since it is larger than the sum of its proper divisors (380025907).

31542143309 is an equidigital number, since it uses as much as digits as its factorization.

31542143309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380025906.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 31542143309 in words is "thirty-one billion, five hundred forty-two million, one hundred forty-three thousand, three hundred nine".