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30312131 = 532392393
BaseRepresentation
bin111001110100…
…0011011000011
32010001000102112
41303220123003
530224442011
63001405535
7515435363
oct163503303
963030375
1030312131
1116123a53
12a1998ab
136384095
1440509a3
1529db58b
hex1ce86c3

30312131 has 8 divisors (see below), whose sum is σ = 31026240. Its totient is φ = 29603392.

The previous prime is 30312127. The next prime is 30312151. The reversal of 30312131 is 13121303.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30312131 - 22 = 30312127 is a prime.

It is a super-2 number, since 2×303121312 = 1837650571522322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30312151) 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, 11471 + ... + 13863.

It is an arithmetic number, because the mean of its divisors is an integer number (3878280).

Almost surely, 230312131 is an apocalyptic number.

30312131 is a deficient number, since it is larger than the sum of its proper divisors (714109).

30312131 is a wasteful number, since it uses less digits than its factorization.

30312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2685.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 30312131 is about 5505.6453754306. The cubic root of 30312131 is about 311.7971609202.

Adding to 30312131 its reverse (13121303), we get a palindrome (43433434).

The spelling of 30312131 in words is "thirty million, three hundred twelve thousand, one hundred thirty-one".

Divisors: 1 53 239 2393 12667 126829 571927 30312131