1623140381 has 2 divisors, whose sum is σ = 1623140382. Its totient is φ = 1623140380.

The previous prime is 1623140371. The next prime is 1623140401. The reversal of 1623140381 is 1830413261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1586428900 + 36711481 = 39830^2 + 6059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1623140381 is a prime.

It is a super-2 number, since 2×1623140381² = 5269169392865650322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1623140371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811570190 + 811570191.

It is an arithmetic number, because the mean of its divisors is an integer number (811570191).

Almost surely, 2^1623140381 is an apocalyptic number.

It is an amenable number.

1623140381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623140381 is an equidigital number, since it uses as much as digits as its factorization.

1623140381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1623140381 is about 40288.2164038072. The cubic root of 1623140381 is about 1175.2187022511.

The spelling of 1623140381 in words is "one billion, six hundred twenty-three million, one hundred forty thousand, three hundred eighty-one".