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261048649 = 10721512
BaseRepresentation
bin11111000111101…
…00100101001001
3200012012122102111
433203310211021
51013312024044
641523102321
76316606531
oct1743644511
9605178374
10261048649
1112439a794
12735119a1
1342110674
14269544c1
1517db7b34
hexf8f4949

261048649 has 9 divisors (see below), whose sum is σ = 265267821. Its totient is φ = 256896300.

The previous prime is 261048647. The next prime is 261048661. The reversal of 261048649 is 946840162.

The square root of 261048649 is 16157.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 261048649 - 21 = 261048647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261048647) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1728724 + ... + 1728874.

Almost surely, 2261048649 is an apocalyptic number.

261048649 is the 16157-th square number.

261048649 is the 8079-th centered octagonal number.

It is an amenable number.

261048649 is a deficient number, since it is larger than the sum of its proper divisors (4219172).

261048649 is an frugal number, since it uses more digits than its factorization.

261048649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The cubic root of 261048649 is about 639.1073566340.

Multiplying 261048649 by its product of nonzero digits (82944), we get a square (21652419142656 = 46532162).

The spelling of 261048649 in words is "two hundred sixty-one million, forty-eight thousand, six hundred forty-nine".