31000402201 has 4 divisors (see below), whose sum is σ = 31013380900. Its totient is φ = 30987423504.

The previous prime is 31000402117. The next prime is 31000402229. The reversal of 31000402201 is 10220400013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10220400013 = 31 ⋅329690323.

It can be written as a sum of positive squares in 2 ways, for example, as 20550656025 + 10449746176 = 143355^2 + 102224^2 .

It is a cyclic number.

It is not a de Polignac number, because 31000402201 - 2¹⁷ = 31000271129 is a prime.

It is a super-2 number, since 2×31000402201² (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 (31000402001) 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, 6485766 + ... + 6490543.

It is an arithmetic number, because the mean of its divisors is an integer number (7753345225).

Almost surely, 2^31000402201 is an apocalyptic number.

It is an amenable number.

31000402201 is a deficient number, since it is larger than the sum of its proper divisors (12978699).

31000402201 is a wasteful number, since it uses less digits than its factorization.

31000402201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12978698.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 31000402201 its reverse (10220400013), we get a palindrome (41220802214).

The spelling of 31000402201 in words is "thirty-one billion, four hundred two thousand, two hundred one".