1401561 has 12 divisors (see below), whose sum is σ = 2313792. Its totient is φ = 800856.

The previous prime is 1401559. The next prime is 1401571. The reversal of 1401561 is 1651041.

It is not a de Polignac number, because 1401561 - 2¹ = 1401559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1401511) 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 11 ways as a sum of consecutive naturals, for example, 11061 + ... + 11186.

It is an arithmetic number, because the mean of its divisors is an integer number (192816).

2^1401561 is an apocalyptic number.

It is an amenable number.

1401561 is a deficient number, since it is larger than the sum of its proper divisors (912231).

1401561 is a wasteful number, since it uses less digits than its factorization.

1401561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22260 (or 22257 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1401561 is about 1183.8754157427. The cubic root of 1401561 is about 111.9104567036.

The spelling of 1401561 in words is "one million, four hundred one thousand, five hundred sixty-one".