1553961 has 16 divisors (see below), whose sum is σ = 2156544. Its totient is φ = 994704.

The previous prime is 1553947. The next prime is 1553971. The reversal of 1553961 is 1693551.

It is not a de Polignac number, because 1553961 - 2⁶ = 1553897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1553971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14470 + ... + 14576.

It is an arithmetic number, because the mean of its divisors is an integer number (134784).

2^1553961 is an apocalyptic number.

It is an amenable number.

1553961 is a deficient number, since it is larger than the sum of its proper divisors (602583).

1553961 is a wasteful number, since it uses less digits than its factorization.

1553961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260.

The product of its digits is 4050, while the sum is 30.

The square root of 1553961 is about 1246.5797206757. The cubic root of 1553961 is about 115.8279504540.

The spelling of 1553961 in words is "one million, five hundred fifty-three thousand, nine hundred sixty-one".