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661012 = 221183181
BaseRepresentation
bin10100001011000010100
31020120201221
42201120110
5132123022
622100124
75422102
oct2413024
91216657
10661012
114116a0
1227a644
131a1b41
14132c72
15d0cc7
hexa1614

661012 has 24 divisors (see below), whose sum is σ = 1284192. Its totient is φ = 295200.

The previous prime is 661009. The next prime is 661019. The reversal of 661012 is 210166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3562 + ... + 3742.

It is an arithmetic number, because the mean of its divisors is an integer number (53508).

2661012 is an apocalyptic number.

661012 is the 664-th pentagonal number.

It is an amenable number.

661012 is a deficient number, since it is larger than the sum of its proper divisors (623180).

661012 is a wasteful number, since it uses less digits than its factorization.

661012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 661012 is about 813.0264448344. The cubic root of 661012 is about 87.1103545236.

Adding to 661012 its reverse (210166), we get a palindrome (871178).

The spelling of 661012 in words is "six hundred sixty-one thousand, twelve".

Divisors: 1 2 4 11 22 44 83 166 181 332 362 724 913 1826 1991 3652 3982 7964 15023 30046 60092 165253 330506 661012