1505981 has 4 divisors (see below), whose sum is σ = 1527264. Its totient is φ = 1484700.

The previous prime is 1505953. The next prime is 1505983. The reversal of 1505981 is 1895051.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1505981 - 2¹⁴ = 1489597 is a prime.

It is a super-2 number, since 2×1505981² = 4535957544722, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 1505981 parts by 1735 straight cuts.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1505983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10535 + ... + 10676.

It is an arithmetic number, because the mean of its divisors is an integer number (381816).

2^1505981 is an apocalyptic number.

It is an amenable number.

1505981 is a deficient number, since it is larger than the sum of its proper divisors (21283).

1505981 is an equidigital number, since it uses as much as digits as its factorization.

1505981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21282.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 1505981 is about 1227.1841752565. The cubic root of 1505981 is about 114.6233677260.

The spelling of 1505981 in words is "one million, five hundred five thousand, nine hundred eighty-one".