31030013213 has 2 divisors, whose sum is σ = 31030013214. Its totient is φ = 31030013212.

The previous prime is 31030013101. The next prime is 31030013257. The reversal of 31030013213 is 31231003013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31013675449 + 16337764 = 176107^2 + 4042^2 .

It is a cyclic number.

It is not a de Polignac number, because 31030013213 - 2²² = 31025818909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31030013191 and 31030013200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31030013263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515006606 + 15515006607.

It is an arithmetic number, because the mean of its divisors is an integer number (15515006607).

Almost surely, 2^31030013213 is an apocalyptic number.

It is an amenable number.

31030013213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31030013213 is an equidigital number, since it uses as much as digits as its factorization.

31030013213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 31030013213 its reverse (31231003013), we get a palindrome (62261016226).

The spelling of 31030013213 in words is "thirty-one billion, thirty million, thirteen thousand, two hundred thirteen".