1651481 has 4 divisors (see below), whose sum is σ = 1778532. Its totient is φ = 1524432.

The previous prime is 1651477. The next prime is 1651493. The reversal of 1651481 is 1841561.

1651481 is nontrivially palindromic in base 4.

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

It can be written as a sum of positive squares in 2 ways, for example, as 259081 + 1392400 = 509^2 + 1180^2 .

It is not a de Polignac number, because 1651481 - 2² = 1651477 is a prime.

It is a super-2 number, since 2×1651481² = 5454778986722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1651481.

It is not an unprimeable number, because it can be changed into a prime (1651411) 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, 63506 + ... + 63531.

It is an arithmetic number, because the mean of its divisors is an integer number (444633).

2^1651481 is an apocalyptic number.

It is an amenable number.

1651481 is a deficient number, since it is larger than the sum of its proper divisors (127051).

1651481 is a wasteful number, since it uses less digits than its factorization.

1651481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127050.

The product of its digits is 960, while the sum is 26.

The square root of 1651481 is about 1285.0996070344. The cubic root of 1651481 is about 118.2019189586.

The spelling of 1651481 in words is "one million, six hundred fifty-one thousand, four hundred eighty-one".