31426289 has 2 divisors, whose sum is σ = 31426290. Its totient is φ = 31426288.

The previous prime is 31426273. The next prime is 31426313. The reversal of 31426289 is 98262413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29757025 + 1669264 = 5455^2 + 1292^2 .

It is an emirp because it is prime and its reverse (98262413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31426289 - 2⁴ = 31426273 is a prime.

It is a super-2 number, since 2×31426289² = 1975223280623042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31426229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15713144 + 15713145.

It is an arithmetic number, because the mean of its divisors is an integer number (15713145).

Almost surely, 2^31426289 is an apocalyptic number.

It is an amenable number.

31426289 is a deficient number, since it is larger than the sum of its proper divisors (1).

31426289 is an equidigital number, since it uses as much as digits as its factorization.

31426289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 31426289 is about 5605.9155362884. The cubic root of 31426289 is about 315.5714461175.

The spelling of 31426289 in words is "thirty-one million, four hundred twenty-six thousand, two hundred eighty-nine".