31405451989 has 2 divisors, whose sum is σ = 31405451990. Its totient is φ = 31405451988.

The previous prime is 31405451981. The next prime is 31405452053. The reversal of 31405451989 is 98915450413.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29155562500 + 2249889489 = 170750^2 + 47433^2 .

It is a cyclic number.

It is not a de Polignac number, because 31405451989 - 2³ = 31405451981 is a prime.

It is a super-3 number, since 3×31405451989³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31405451981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702725994 + 15702725995.

It is an arithmetic number, because the mean of its divisors is an integer number (15702725995).

Almost surely, 2^31405451989 is an apocalyptic number.

It is an amenable number.

31405451989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31405451989 is an equidigital number, since it uses as much as digits as its factorization.

31405451989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 31405451989 in words is "thirty-one billion, four hundred five million, four hundred fifty-one thousand, nine hundred eighty-nine".