1661534 has 8 divisors (see below), whose sum is σ = 2848368. Its totient is φ = 712080.

The previous prime is 1661519. The next prime is 1661549. The reversal of 1661534 is 4351661.

It is an interprime number because it is at equal distance from previous prime (1661519) and next prime (1661549).

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59327 + ... + 59354.

It is an arithmetic number, because the mean of its divisors is an integer number (356046).

2^1661534 is an apocalyptic number.

1661534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1661534 is a deficient number, since it is larger than the sum of its proper divisors (1186834).

1661534 is a wasteful number, since it uses less digits than its factorization.

1661534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118690.

The product of its digits is 2160, while the sum is 26.

The square root of 1661534 is about 1289.0050426589. The cubic root of 1661534 is about 118.4412760125.

The spelling of 1661534 in words is "one million, six hundred sixty-one thousand, five hundred thirty-four".