31550106 has 16 divisors (see below), whose sum is σ = 72114624. Its totient is φ = 9014304.

The previous prime is 31550093. The next prime is 31550107. The reversal of 31550106 is 60105513.

It is a happy number.

It is a super-2 number, since 2×31550106² = 1990818377222472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (31550107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375555 + ... + 375638.

It is an arithmetic number, because the mean of its divisors is an integer number (4507164).

Almost surely, 2^31550106 is an apocalyptic number.

31550106 is an abundant number, since it is smaller than the sum of its proper divisors (40564518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31550106 is a wasteful number, since it uses less digits than its factorization.

31550106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751205.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 31550106 is about 5616.9481037304. The cubic root of 31550106 is about 315.9853448846.

Adding to 31550106 its reverse (60105513), we get a palindrome (91655619).

The spelling of 31550106 in words is "thirty-one million, five hundred fifty thousand, one hundred six".