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138825013781 = 3118289244859
BaseRepresentation
bin1000000101001010011…
…1011001101000010101
3111021022221202101200002
42001102213121220111
54233303200420111
6143435245501045
713013133101336
oct2012247315025
9437287671602
10138825013781
115396a112653
1222aa4271785
131012531808c
146a0d57028d
1539279c763b
hex20529d9a15

138825013781 has 8 divisors (see below), whose sum is σ = 143311660800. Its totient is φ = 134338893120.

The previous prime is 138825013729. The next prime is 138825013783. The reversal of 138825013781 is 187310528831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-138825013781 is a prime.

It is a super-2 number, since 2×1388250137812 (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138825013783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444530 + ... + 689388.

It is an arithmetic number, because the mean of its divisors is an integer number (17913957600).

Almost surely, 2138825013781 is an apocalyptic number.

It is an amenable number.

138825013781 is a deficient number, since it is larger than the sum of its proper divisors (4486647019).

138825013781 is a wasteful number, since it uses less digits than its factorization.

138825013781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263179.

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 138825013781 in words is "one hundred thirty-eight billion, eight hundred twenty-five million, thirteen thousand, seven hundred eighty-one".

Divisors: 1 31 18289 244859 566959 7590629 4478226251 138825013781