31130155 has 16 divisors (see below), whose sum is σ = 44550144. Its totient is φ = 20417760.

The previous prime is 31130149. The next prime is 31130161. The reversal of 31130155 is 55103113.

It is an interprime number because it is at equal distance from previous prime (31130149) and next prime (31130161).

It is not a de Polignac number, because 31130155 - 2³ = 31130147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18531 + ... + 20140.

It is an arithmetic number, because the mean of its divisors is an integer number (2784384).

Almost surely, 2^31130155 is an apocalyptic number.

31130155 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31130155 is a deficient number, since it is larger than the sum of its proper divisors (13419989).

31130155 is a wasteful number, since it uses less digits than its factorization.

31130155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38706.

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

The square root of 31130155 is about 5579.4403841246. The cubic root of 31130155 is about 314.5770926743.

Adding to 31130155 its reverse (55103113), we get a palindrome (86233268).

The spelling of 31130155 in words is "thirty-one million, one hundred thirty thousand, one hundred fifty-five".