31378740431 has 4 divisors (see below), whose sum is σ = 31379529864. Its totient is φ = 31377951000.

The previous prime is 31378740427. The next prime is 31378740433. The reversal of 31378740431 is 13404787313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13404787313 = 37 ⋅362291549.

It is a cyclic number.

It is not a de Polignac number, because 31378740431 - 2² = 31378740427 is a prime.

It is a super-2 number, since 2×31378740431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31378740433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331745 + ... + 415706.

It is an arithmetic number, because the mean of its divisors is an integer number (7844882466).

Almost surely, 2^31378740431 is an apocalyptic number.

31378740431 is a deficient number, since it is larger than the sum of its proper divisors (789433).

31378740431 is an equidigital number, since it uses as much as digits as its factorization.

31378740431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789432.

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 31378740431 in words is "thirty-one billion, three hundred seventy-eight million, seven hundred forty thousand, four hundred thirty-one".