1550261 has 4 divisors (see below), whose sum is σ = 1559712. Its totient is φ = 1540812.

The previous prime is 1550257. The next prime is 1550287. The reversal of 1550261 is 1620551.

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 1550261 - 2² = 1550257 is a prime.

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 (1550221) 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, 4475 + ... + 4808.

It is an arithmetic number, because the mean of its divisors is an integer number (389928).

2^1550261 is an apocalyptic number.

It is an amenable number.

1550261 is a deficient number, since it is larger than the sum of its proper divisors (9451).

1550261 is an equidigital number, since it uses as much as digits as its factorization.

1550261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1550261 is about 1245.0947755091. The cubic root of 1550261 is about 115.7359481439.

It can be divided in two parts, 1550 and 261, that multiplied together give a triangular number (404550 = T₈₉₉).

The spelling of 1550261 in words is "one million, five hundred fifty thousand, two hundred sixty-one".