1431432557 has 4 divisors (see below), whose sum is σ = 1438849500. Its totient is φ = 1424015616.

The previous prime is 1431432551. The next prime is 1431432559. The reversal of 1431432557 is 7552341341.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 708145321 + 723287236 = 26611^2 + 26894^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431432557 - 2⁶ = 1431432493 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 (1431432551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3708182 + ... + 3708567.

It is an arithmetic number, because the mean of its divisors is an integer number (359712375).

Almost surely, 2^1431432557 is an apocalyptic number.

It is an amenable number.

1431432557 is a deficient number, since it is larger than the sum of its proper divisors (7416943).

1431432557 is an equidigital number, since it uses as much as digits as its factorization.

1431432557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7416942.

The product of its digits is 50400, while the sum is 35.

The square root of 1431432557 is about 37834.2775403469. The cubic root of 1431432557 is about 1126.9992583426. Note that the first 3 decimals are identical.

Adding to 1431432557 its reverse (7552341341), we get a palindrome (8983773898).

The spelling of 1431432557 in words is "one billion, four hundred thirty-one million, four hundred thirty-two thousand, five hundred fifty-seven".