1431561541 has 2 divisors, whose sum is σ = 1431561542. Its totient is φ = 1431561540.

The previous prime is 1431561491. The next prime is 1431561559. The reversal of 1431561541 is 1451651341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 811053441 + 620508100 = 28479^2 + 24910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1431561541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431561841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715780770 + 715780771.

It is an arithmetic number, because the mean of its divisors is an integer number (715780771).

Almost surely, 2^1431561541 is an apocalyptic number.

It is an amenable number.

1431561541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431561541 is an equidigital number, since it uses as much as digits as its factorization.

1431561541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 1431561541 is about 37835.9820937689. The cubic root of 1431561541 is about 1127.0331080003.

The spelling of 1431561541 in words is "one billion, four hundred thirty-one million, five hundred sixty-one thousand, five hundred forty-one".