Search a number
-
+
61881921 = 3317314349
BaseRepresentation
bin1110110000001…
…1111001000001
311022102221001000
43230003321001
5111320210141
610050202213
71350662523
oct354037101
9138387030
1061881921
1131a26892
1218883369
13ca8872a
14830ba13
1556755b6
hex3b03e41

61881921 has 32 divisors (see below), whose sum is σ = 100224000. Its totient is φ = 37566720.

The previous prime is 61881901. The next prime is 61881931. The reversal of 61881921 is 12918816.

61881921 is a `hidden beast` number, since 618 + 8 + 19 + 21 = 666.

It is not a de Polignac number, because 61881921 - 29 = 61881409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61881901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12055 + ... + 16403.

It is an arithmetic number, because the mean of its divisors is an integer number (3132000).

Almost surely, 261881921 is an apocalyptic number.

It is an amenable number.

61881921 is a deficient number, since it is larger than the sum of its proper divisors (38342079).

61881921 is a wasteful number, since it uses less digits than its factorization.

61881921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406 (or 4400 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 61881921 is about 7866.5062766135. The cubic root of 61881921 is about 395.5377411384.

The spelling of 61881921 in words is "sixty-one million, eight hundred eighty-one thousand, nine hundred twenty-one".

Divisors: 1 3 9 17 27 31 51 93 153 279 459 527 837 1581 4349 4743 13047 14229 39141 73933 117423 134819 221799 404457 665397 1213371 1996191 2291923 3640113 6875769 20627307 61881921