1431661 has 8 divisors (see below), whose sum is σ = 1785024. Its totient is φ = 1115520.

The previous prime is 1431659. The next prime is 1431713. The reversal of 1431661 is 1661341.

It is a happy number.

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

It is not a de Polignac number, because 1431661 - 2¹ = 1431659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1431601) 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, 9220 + ... + 9373.

It is an arithmetic number, because the mean of its divisors is an integer number (223128).

2^1431661 is an apocalyptic number.

1431661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1431661 is a deficient number, since it is larger than the sum of its proper divisors (353363).

1431661 is a wasteful number, since it uses less digits than its factorization.

1431661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18611.

The product of its digits is 432, while the sum is 22.

The square root of 1431661 is about 1196.5203717447. The cubic root of 1431661 is about 112.7059207935.

The spelling of 1431661 in words is "one million, four hundred thirty-one thousand, six hundred sixty-one".