31420847 has 2 divisors, whose sum is σ = 31420848. Its totient is φ = 31420846.

The previous prime is 31420843. The next prime is 31420853. The reversal of 31420847 is 74802413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31420847 - 2² = 31420843 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31420841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710423 + 15710424.

It is an arithmetic number, because the mean of its divisors is an integer number (15710424).

Almost surely, 2^31420847 is an apocalyptic number.

31420847 is a deficient number, since it is larger than the sum of its proper divisors (1).

31420847 is an equidigital number, since it uses as much as digits as its factorization.

31420847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 31420847 is about 5605.4301351457. The cubic root of 31420847 is about 315.5532295330.

The spelling of 31420847 in words is "thirty-one million, four hundred twenty thousand, eight hundred forty-seven".