31012101 has 6 divisors (see below), whose sum is σ = 44795270. Its totient is φ = 20674728.

The previous prime is 31012099. The next prime is 31012117. The reversal of 31012101 is 10121013.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 14243076 = 4095^2 + 3774^2 .

It is not a de Polignac number, because 31012101 - 2¹ = 31012099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 3445789 = 31012101 / (3 + 1 + 0 + 1 + 2 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1722886 + ... + 1722903.

Almost surely, 2^31012101 is an apocalyptic number.

It is an amenable number.

31012101 is a deficient number, since it is larger than the sum of its proper divisors (13783169).

31012101 is a wasteful number, since it uses less digits than its factorization.

31012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3445795 (or 3445792 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 31012101 is about 5568.8509586808. The cubic root of 31012101 is about 314.1789350263.

Adding to 31012101 its reverse (10121013), we get a palindrome (41133114).

It can be divided in two parts, 31012 and 101, that added together give a palindrome (31113).

The spelling of 31012101 in words is "thirty-one million, twelve thousand, one hundred one".