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261493951 is a prime number
BaseRepresentation
bin11111001011000…
…01010010111111
3200020001021021011
433211201102333
51013420301301
641540420051
76323443015
oct1745412277
9606037234
10261493951
11124674304
12736a7627
1342238264
1426a2c8b5
1517e54a51
hexf9614bf

261493951 has 2 divisors, whose sum is σ = 261493952. Its totient is φ = 261493950.

The previous prime is 261493937. The next prime is 261493993. The reversal of 261493951 is 159394162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261493951 - 221 = 259396799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261493901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130746975 + 130746976.

It is an arithmetic number, because the mean of its divisors is an integer number (130746976).

Almost surely, 2261493951 is an apocalyptic number.

261493951 is a deficient number, since it is larger than the sum of its proper divisors (1).

261493951 is an equidigital number, since it uses as much as digits as its factorization.

261493951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 261493951 is about 16170.7745949290. The cubic root of 261493951 is about 639.4705508960.

The spelling of 261493951 in words is "two hundred sixty-one million, four hundred ninety-three thousand, nine hundred fifty-one".