31436129 has 2 divisors, whose sum is σ = 31436130. Its totient is φ = 31436128.

The previous prime is 31436113. The next prime is 31436137. The reversal of 31436129 is 92163413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18939904 + 12496225 = 4352^2 + 3535^2 .

It is an emirp because it is prime and its reverse (92163413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31436129 - 2⁴ = 31436113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31436189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15718064 + 15718065.

It is an arithmetic number, because the mean of its divisors is an integer number (15718065).

Almost surely, 2^31436129 is an apocalyptic number.

It is an amenable number.

31436129 is a deficient number, since it is larger than the sum of its proper divisors (1).

31436129 is an equidigital number, since it uses as much as digits as its factorization.

31436129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 31436129 is about 5606.7931119313. The cubic root of 31436129 is about 315.6043792560.

The spelling of 31436129 in words is "thirty-one million, four hundred thirty-six thousand, one hundred twenty-nine".