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71428531 is a prime number
BaseRepresentation
bin1000100000111…
…10100110110011
311222101221112011
410100132212303
5121241203111
611030543351
71525063306
oct420364663
9158357464
1071428531
1137357349
121bb07b57
1311a4bb05
1496b4b3d
15640e021
hex441e9b3

71428531 has 2 divisors, whose sum is σ = 71428532. Its totient is φ = 71428530.

The previous prime is 71428517. The next prime is 71428541. The reversal of 71428531 is 13582417.

It is a strong prime.

It is an emirp because it is prime and its reverse (13582417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71428531 - 213 = 71420339 is a prime.

It is a super-2 number, since 2×714285312 = 10204070081635922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71428493 and 71428502.

It is not a weakly prime, because it can be changed into another prime (71428541) 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, 35714265 + 35714266.

It is an arithmetic number, because the mean of its divisors is an integer number (35714266).

Almost surely, 271428531 is an apocalyptic number.

71428531 is a deficient number, since it is larger than the sum of its proper divisors (1).

71428531 is an equidigital number, since it uses as much as digits as its factorization.

71428531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 71428531 is about 8451.5401554983. The cubic root of 71428531 is about 414.9131884028.

The spelling of 71428531 in words is "seventy-one million, four hundred twenty-eight thousand, five hundred thirty-one".