1431891641 has 2 divisors, whose sum is σ = 1431891642. Its totient is φ = 1431891640.

The previous prime is 1431891563. The next prime is 1431891649. The reversal of 1431891641 is 1461981341.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1247502400 + 184389241 = 35320^2 + 13579^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431891641 - 2¹⁰ = 1431890617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1431891595 and 1431891604.

It is not a weakly prime, because it can be changed into another prime (1431891649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715945820 + 715945821.

It is an arithmetic number, because the mean of its divisors is an integer number (715945821).

Almost surely, 2^1431891641 is an apocalyptic number.

It is an amenable number.

1431891641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431891641 is an equidigital number, since it uses as much as digits as its factorization.

1431891641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 1431891641 is about 37840.3440919873. The cubic root of 1431891641 is about 1127.1197278734.

The spelling of 1431891641 in words is "one billion, four hundred thirty-one million, eight hundred ninety-one thousand, six hundred forty-one".