1290261 has 8 divisors (see below), whose sum is σ = 1966144. Its totient is φ = 737280.

The previous prime is 1290259. The next prime is 1290287. The reversal of 1290261 is 1620921.

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

It is not a de Polignac number, because 1290261 - 2¹ = 1290259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 61441 = 1290261 / (1 + 2 + 9 + 0 + 2 + 6 + 1).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30700 + ... + 30741.

It is an arithmetic number, because the mean of its divisors is an integer number (245768).

2^1290261 is an apocalyptic number.

It is an amenable number.

1290261 is a deficient number, since it is larger than the sum of its proper divisors (675883).

1290261 is an equidigital number, since it uses as much as digits as its factorization.

1290261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61451.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1290261 is about 1135.8965621922. The cubic root of 1290261 is about 108.8660644850.

It can be divided in two parts, 1290 and 261, that added together give a palindrome (1551).

The spelling of 1290261 in words is "one million, two hundred ninety thousand, two hundred sixty-one".