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145931 is a prime number
BaseRepresentation
bin100011101000001011
321102011212
4203220023
514132211
63043335
71145312
oct435013
9242155
10145931
119a705
127054b
1351566
143b279
152d38b
hex23a0b

145931 has 2 divisors, whose sum is σ = 145932. Its totient is φ = 145930.

The previous prime is 145903. The next prime is 145933. The reversal of 145931 is 139541.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-145931 is a prime.

It is a super-2 number, since 2×1459312 = 42591713522, which contains 22 as substring.

Together with 145933, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 1 + 48 + 92 + 57 + 37 + 1 .

It is a junction number, because it is equal to n+sod(n) for n = 145897 and 145906.

It is not a weakly prime, because it can be changed into another prime (145933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72965 + 72966.

It is an arithmetic number, because the mean of its divisors is an integer number (72966).

2145931 is an apocalyptic number.

145931 is a deficient number, since it is larger than the sum of its proper divisors (1).

145931 is an equidigital number, since it uses as much as digits as its factorization.

145931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 23.

The square root of 145931 is about 382.0091621938. The cubic root of 145931 is about 52.6480777923.

The spelling of 145931 in words is "one hundred forty-five thousand, nine hundred thirty-one".