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31968913 is a prime number
BaseRepresentation
bin111100111110…
…0111010010001
32020011012002211
41321330322101
531141001123
63101112121
7535505554
oct171747221
966135084
1031968913
1117055799
12a858641
136814222
14436269b
152c1740d
hex1e7ce91

31968913 has 2 divisors, whose sum is σ = 31968914. Its totient is φ = 31968912.

The previous prime is 31968907. The next prime is 31968929. The reversal of 31968913 is 31986913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31002624 + 966289 = 5568^2 + 983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-31968913 is a prime.

It is a super-2 number, since 2×319689132 = 2044022796803138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31968953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15984456 + 15984457.

It is an arithmetic number, because the mean of its divisors is an integer number (15984457).

Almost surely, 231968913 is an apocalyptic number.

It is an amenable number.

31968913 is a deficient number, since it is larger than the sum of its proper divisors (1).

31968913 is an equidigital number, since it uses as much as digits as its factorization.

31968913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 31968913 is about 5654.1058532716. The cubic root of 31968913 is about 317.3773697166.

The spelling of 31968913 in words is "thirty-one million, nine hundred sixty-eight thousand, nine hundred thirteen".