1438961831 has 2 divisors, whose sum is σ = 1438961832. Its totient is φ = 1438961830.

The previous prime is 1438961779. The next prime is 1438961837. The reversal of 1438961831 is 1381698341.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1438961831 - 2⁶ = 1438961767 is a prime.

It is a super-2 number, since 2×1438961831² = 4141222302149745122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438961837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719480915 + 719480916.

It is an arithmetic number, because the mean of its divisors is an integer number (719480916).

Almost surely, 2^1438961831 is an apocalyptic number.

1438961831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438961831 is an equidigital number, since it uses as much as digits as its factorization.

1438961831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The square root of 1438961831 is about 37933.6503779955. The cubic root of 1438961831 is about 1128.9717931834.

The spelling of 1438961831 in words is "one billion, four hundred thirty-eight million, nine hundred sixty-one thousand, eight hundred thirty-one".