661029 has 8 divisors (see below), whose sum is σ = 927840. Its totient is φ = 417456.

The previous prime is 661027. The next prime is 661049. The reversal of 661029 is 920166.

661029 = 267² + 268² + ... + 275².

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

It is not a de Polignac number, because 661029 - 2¹ = 661027 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661027) 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, 5742 + ... + 5855.

It is an arithmetic number, because the mean of its divisors is an integer number (115980).

2⁶⁶¹⁰²⁹ is an apocalyptic number.

It is an amenable number.

661029 is a deficient number, since it is larger than the sum of its proper divisors (266811).

661029 is a wasteful number, since it uses less digits than its factorization.

661029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11619.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 661029 is about 813.0368995316. The cubic root of 661029 is about 87.1111012893. Note that the first 4 decimals are identical.

The spelling of 661029 in words is "six hundred sixty-one thousand, twenty-nine".