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BaseRepresentation
bin11111110111100011
320122001111
4133313203
513134111
62444151
71052362
oct376743
9218044
10130531
118a085
1263657
134754b
14357d9
1528a21
hex1fde3

130531 has 2 divisors, whose sum is σ = 130532. Its totient is φ = 130530.

The previous prime is 130523. The next prime is 130547. The reversal of 130531 is 135031.

Adding to 130531 its reverse (135031), we get a palindrome (265562).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 130531 - 23 = 130523 is a prime.

It is a super-2 number, since 2×1305312 = 34076683922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (130631) 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 as a sum of consecutive naturals, namely, 65265 + 65266.

It is an arithmetic number, because the mean of its divisors is an integer number (65266).

2130531 is an apocalyptic number.

130531 is the 229-th centered pentagonal number.

130531 is a deficient number, since it is larger than the sum of its proper divisors (1).

130531 is an equidigital number, since it uses as much as digits as its factorization.

130531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45, while the sum is 13.

The square root of 130531 is about 361.2907416472. The cubic root of 130531 is about 50.7268492692.

The spelling of 130531 in words is "one hundred thirty thousand, five hundred thirty-one".