1651261 has 8 divisors (see below), whose sum is σ = 1763640. Its totient is φ = 1540608.

The previous prime is 1651259. The next prime is 1651267. The reversal of 1651261 is 1621561.

It can be written as a sum of positive squares in 4 ways, for example, as 225625 + 1425636 = 475^2 + 1194^2 .

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

It is not a de Polignac number, because 1651261 - 2¹ = 1651259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1975 + ... + 2683.

It is an arithmetic number, because the mean of its divisors is an integer number (220455).

2^1651261 is an apocalyptic number.

It is an amenable number.

1651261 is a deficient number, since it is larger than the sum of its proper divisors (112379).

1651261 is a wasteful number, since it uses less digits than its factorization.

1651261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863.

The product of its digits is 360, while the sum is 22.

The square root of 1651261 is about 1285.0140077058. The cubic root of 1651261 is about 118.1966700180.

The spelling of 1651261 in words is "one million, six hundred fifty-one thousand, two hundred sixty-one".