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261493993 is a prime number
BaseRepresentation
bin11111001011000…
…01010011101001
3200020001021022201
433211201103221
51013420301433
641540420201
76323443105
oct1745412351
9606037281
10261493993
11124674342
12736a7661
1342238297
1426a2c905
1517e54a7d
hexf9614e9

261493993 has 2 divisors, whose sum is σ = 261493994. Its totient is φ = 261493992.

The previous prime is 261493951. The next prime is 261494011. The reversal of 261493993 is 399394162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186377104 + 75116889 = 13652^2 + 8667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-261493993 is a prime.

It is not a weakly prime, because it can be changed into another prime (261493933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130746996 + 130746997.

It is an arithmetic number, because the mean of its divisors is an integer number (130746997).

Almost surely, 2261493993 is an apocalyptic number.

It is an amenable number.

261493993 is a deficient number, since it is larger than the sum of its proper divisors (1).

261493993 is an equidigital number, since it uses as much as digits as its factorization.

261493993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 46.

The square root of 261493993 is about 16170.7758935680. The cubic root of 261493993 is about 639.4705851323.

The spelling of 261493993 in words is "two hundred sixty-one million, four hundred ninety-three thousand, nine hundred ninety-three".