1431640061 has 4 divisors (see below), whose sum is σ = 1433492892. Its totient is φ = 1429787232.

The previous prime is 1431640051. The next prime is 1431640073. The reversal of 1431640061 is 1600461341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1600461341 = 883 ⋅1812527.

It can be written as a sum of positive squares in 2 ways, for example, as 423577561 + 1008062500 = 20581^2 + 31750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1431640061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1431640061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1431640051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925256 + ... + 926801.

It is an arithmetic number, because the mean of its divisors is an integer number (358373223).

Almost surely, 2^1431640061 is an apocalyptic number.

It is an amenable number.

1431640061 is a deficient number, since it is larger than the sum of its proper divisors (1852831).

1431640061 is an equidigital number, since it uses as much as digits as its factorization.

1431640061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852830.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1431640061 is about 37837.0197161457. The cubic root of 1431640061 is about 1127.0537132436.

The spelling of 1431640061 in words is "one billion, four hundred thirty-one million, six hundred forty thousand, sixty-one".