1523642012381 has 2 divisors, whose sum is σ = 1523642012382. Its totient is φ = 1523642012380.

The previous prime is 1523642012377. The next prime is 1523642012419. The reversal of 1523642012381 is 1832102463251.

It is an a-pointer prime, because the next prime (1523642012419) can be obtained adding 1523642012381 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 942287611225 + 581354401156 = 970715^2 + 762466^2 .

It is a cyclic number.

It is not a de Polignac number, because 1523642012381 - 2² = 1523642012377 is a prime.

It is a super-2 number, since 2×1523642012381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1523642012281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761821006190 + 761821006191.

It is an arithmetic number, because the mean of its divisors is an integer number (761821006191).

Almost surely, 2^{1523642012381} is an apocalyptic number.

It is an amenable number.

1523642012381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1523642012381 is an equidigital number, since it uses as much as digits as its factorization.

1523642012381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 1523642012381 in words is "one trillion, five hundred twenty-three billion, six hundred forty-two million, twelve thousand, three hundred eighty-one".