31212061 has 2 divisors, whose sum is σ = 31212062. Its totient is φ = 31212060.

The previous prime is 31212059. The next prime is 31212113. The reversal of 31212061 is 16021213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19412836 + 11799225 = 4406^2 + 3435^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212061 - 2¹ = 31212059 is a prime.

Together with 31212059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606030 + 15606031.

It is an arithmetic number, because the mean of its divisors is an integer number (15606031).

Almost surely, 2^31212061 is an apocalyptic number.

It is an amenable number.

31212061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212061 is an equidigital number, since it uses as much as digits as its factorization.

31212061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 31212061 is about 5586.7755458762. The cubic root of 31212061 is about 314.8527438026.

Adding to 31212061 its reverse (16021213), we get a palindrome (47233274).

The spelling of 31212061 in words is "thirty-one million, two hundred twelve thousand, sixty-one".