1555641 has 6 divisors (see below), whose sum is σ = 2247050. Its totient is φ = 1037088.

The previous prime is 1555639. The next prime is 1555643. The reversal of 1555641 is 1465551.

It is a happy number.

1555641 is a `hidden beast` number, since 15 + 5 + 5 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (1555639) and next prime (1555643).

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 484416 = 1035^2 + 696^2 .

It is not a de Polignac number, because 1555641 - 2¹ = 1555639 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86416 + ... + 86433.

2^1555641 is an apocalyptic number.

It is an amenable number.

1555641 is a deficient number, since it is larger than the sum of its proper divisors (691409).

1555641 is a wasteful number, since it uses less digits than its factorization.

1555641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172855 (or 172852 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 1555641 is about 1247.2533824368. The cubic root of 1555641 is about 115.8696762705.

The spelling of 1555641 in words is "one million, five hundred fifty-five thousand, six hundred forty-one".