31401887273 has 2 divisors, whose sum is σ = 31401887274. Its totient is φ = 31401887272.

The previous prime is 31401887269. The next prime is 31401887291. The reversal of 31401887273 is 37278810413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31400903209 + 984064 = 177203^2 + 992^2 .

It is a cyclic number.

It is not a de Polignac number, because 31401887273 - 2² = 31401887269 is a prime.

It is not a weakly prime, because it can be changed into another prime (31404887273) 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 as a sum of consecutive naturals, namely, 15700943636 + 15700943637.

It is an arithmetic number, because the mean of its divisors is an integer number (15700943637).

Almost surely, 2^31401887273 is an apocalyptic number.

It is an amenable number.

31401887273 is a deficient number, since it is larger than the sum of its proper divisors (1).

31401887273 is an equidigital number, since it uses as much as digits as its factorization.

31401887273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 31401887273 in words is "thirty-one billion, four hundred one million, eight hundred eighty-seven thousand, two hundred seventy-three".