31231780349 has 16 divisors (see below), whose sum is σ = 39339758976. Its totient is φ = 24085555200.

The previous prime is 31231780343. The next prime is 31231780361. The reversal of 31231780349 is 94308713213.

It is not a de Polignac number, because 31231780349 - 2³² = 26936813053 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231780343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2083292 + ... + 2098229.

It is an arithmetic number, because the mean of its divisors is an integer number (2458734936).

Almost surely, 2^31231780349 is an apocalyptic number.

It is an amenable number.

31231780349 is a deficient number, since it is larger than the sum of its proper divisors (8107978627).

31231780349 is a wasteful number, since it uses less digits than its factorization.

31231780349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181636.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 31231780349 in words is "thirty-one billion, two hundred thirty-one million, seven hundred eighty thousand, three hundred forty-nine".