31478129 has 2 divisors, whose sum is σ = 31478130. Its totient is φ = 31478128.

The previous prime is 31478089. The next prime is 31478147. The reversal of 31478129 is 92187413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17430625 + 14047504 = 4175^2 + 3748^2 .

It is a cyclic number.

It is not a de Polignac number, because 31478129 - 2¹² = 31474033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31478179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15739064 + 15739065.

It is an arithmetic number, because the mean of its divisors is an integer number (15739065).

Almost surely, 2^31478129 is an apocalyptic number.

It is an amenable number.

31478129 is a deficient number, since it is larger than the sum of its proper divisors (1).

31478129 is an equidigital number, since it uses as much as digits as its factorization.

31478129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 31478129 is about 5610.5373182967. The cubic root of 31478129 is about 315.7448703139.

The spelling of 31478129 in words is "thirty-one million, four hundred seventy-eight thousand, one hundred twenty-nine".