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25531031 is a prime number
BaseRepresentation
bin110000101100…
…1001010010111
31210001002222202
41201121022113
523013443111
62311115115
7430003331
oct141311227
953032882
1025531031
1113458929
128672a9b
13539bb26
143568451
152394b3b
hex1859297

25531031 has 2 divisors, whose sum is σ = 25531032. Its totient is φ = 25531030.

The previous prime is 25531021. The next prime is 25531039. The reversal of 25531031 is 13013552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25531031 - 210 = 25530007 is a prime.

It is a super-2 number, since 2×255310312 = 1303667087845922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25530994 and 25531012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25531039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765515 + 12765516.

It is an arithmetic number, because the mean of its divisors is an integer number (12765516).

Almost surely, 225531031 is an apocalyptic number.

25531031 is a deficient number, since it is larger than the sum of its proper divisors (1).

25531031 is an equidigital number, since it uses as much as digits as its factorization.

25531031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 25531031 is about 5052.8240618490. The cubic root of 25531031 is about 294.4576110511.

Adding to 25531031 its reverse (13013552), we get a palindrome (38544583).

The spelling of 25531031 in words is "twenty-five million, five hundred thirty-one thousand, thirty-one".