31229801 has 2 divisors, whose sum is σ = 31229802. Its totient is φ = 31229800.

The previous prime is 31229797. The next prime is 31229831. The reversal of 31229801 is 10892213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29986576 + 1243225 = 5476^2 + 1115^2 .

It is an emirp because it is prime and its reverse (10892213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31229801 - 2² = 31229797 is a prime.

It is not a weakly prime, because it can be changed into another prime (31229831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15614900 + 15614901.

It is an arithmetic number, because the mean of its divisors is an integer number (15614901).

Almost surely, 2^31229801 is an apocalyptic number.

It is an amenable number.

31229801 is a deficient number, since it is larger than the sum of its proper divisors (1).

31229801 is an equidigital number, since it uses as much as digits as its factorization.

31229801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 31229801 is about 5588.3629982312. The cubic root of 31229801 is about 314.9123834592.

The spelling of 31229801 in words is "thirty-one million, two hundred twenty-nine thousand, eight hundred one".