1451981 has 4 divisors (see below), whose sum is σ = 1485792. Its totient is φ = 1418172.

The previous prime is 1451969. The next prime is 1452047. The reversal of 1451981 is 1891541.

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 1451981 - 2¹⁴ = 1435597 is a prime.

It is a super-2 number, since 2×1451981² = 4216497648722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1451911) 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, 16841 + ... + 16926.

It is an arithmetic number, because the mean of its divisors is an integer number (371448).

2^1451981 is an apocalyptic number.

It is an amenable number.

1451981 is a deficient number, since it is larger than the sum of its proper divisors (33811).

1451981 is an equidigital number, since it uses as much as digits as its factorization.

1451981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33810.

The product of its digits is 1440, while the sum is 29.

The square root of 1451981 is about 1204.9817426003. The cubic root of 1451981 is about 113.2366409042.

Subtracting from 1451981 its product of digits (1440), we obtain a palindrome (1450541).

The spelling of 1451981 in words is "one million, four hundred fifty-one thousand, nine hundred eighty-one".