661498 has 4 divisors (see below), whose sum is σ = 992250. Its totient is φ = 330748.

The previous prime is 661483. The next prime is 661513. The reversal of 661498 is 894166.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (661483) and next prime (661513).

It can be written as a sum of positive squares in only one way, i.e., 660969 + 529 = 813^2 + 23^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165373 + ... + 165376.

2⁶⁶¹⁴⁹⁸ is an apocalyptic number.

661498 is a deficient number, since it is larger than the sum of its proper divisors (330752).

661498 is a wasteful number, since it uses less digits than its factorization.

661498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330751.

The product of its digits is 10368, while the sum is 34.

The square root of 661498 is about 813.3252731841. The cubic root of 661498 is about 87.1316981910.

It can be divided in two parts, 6 and 61498, that added together give a square (61504 = 248²).

The spelling of 661498 in words is "six hundred sixty-one thousand, four hundred ninety-eight".