31301020129 has 4 divisors (see below), whose sum is σ = 32146993684. Its totient is φ = 30455046576.

The previous prime is 31301020123. The next prime is 31301020133. The reversal of 31301020129 is 92102010313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23340811729 + 7960208400 = 152777^2 + 89220^2 .

It is a cyclic number.

It is not a de Polignac number, because 31301020129 - 2¹¹ = 31301018081 is a prime.

It is a super-2 number, since 2×31301020129² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31301020123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422986722 + ... + 422986795.

It is an arithmetic number, because the mean of its divisors is an integer number (8036748421).

Almost surely, 2^31301020129 is an apocalyptic number.

It is an amenable number.

31301020129 is a deficient number, since it is larger than the sum of its proper divisors (845973555).

31301020129 is an equidigital number, since it uses as much as digits as its factorization.

31301020129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845973554.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 31301020129 in words is "thirty-one billion, three hundred one million, twenty thousand, one hundred twenty-nine".