1431771421 has 2 divisors, whose sum is σ = 1431771422. Its totient is φ = 1431771420.

The previous prime is 1431771409. The next prime is 1431771427. The reversal of 1431771421 is 1241771341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1155048196 + 276723225 = 33986^2 + 16635^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431771421 - 2²¹ = 1429674269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431771427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715885710 + 715885711.

It is an arithmetic number, because the mean of its divisors is an integer number (715885711).

Almost surely, 2^1431771421 is an apocalyptic number.

It is an amenable number.

1431771421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431771421 is an equidigital number, since it uses as much as digits as its factorization.

1431771421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 1431771421 is about 37838.7555424329. The cubic root of 1431771421 is about 1127.0881830921.

The spelling of 1431771421 in words is "one billion, four hundred thirty-one million, seven hundred seventy-one thousand, four hundred twenty-one".