31105153 has 4 divisors (see below), whose sum is σ = 31125460. Its totient is φ = 31084848.

The previous prime is 31105141. The next prime is 31105157. The reversal of 31105153 is 35150113.

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 5531904 + 25573249 = 2352^2 + 5057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31105153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31105153.

It is not an unprimeable number, because it can be changed into a prime (31105157) 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, 7650 + ... + 10987.

It is an arithmetic number, because the mean of its divisors is an integer number (7781365).

Almost surely, 2^31105153 is an apocalyptic number.

It is an amenable number.

31105153 is a deficient number, since it is larger than the sum of its proper divisors (20307).

31105153 is a wasteful number, since it uses less digits than its factorization.

31105153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20306.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 31105153 is about 5577.1993867890. The cubic root of 31105153 is about 314.4928532072.

Adding to 31105153 its reverse (35150113), we get a palindrome (66255266).

The spelling of 31105153 in words is "thirty-one million, one hundred five thousand, one hundred fifty-three".