1495621573981 has 2 divisors, whose sum is σ = 1495621573982. Its totient is φ = 1495621573980.

The previous prime is 1495621573969. The next prime is 1495621574003. The reversal of 1495621573981 is 1893751265941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1289210368356 + 206411205625 = 1135434^2 + 454325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1495621573981 - 2²¹ = 1495619476829 is a prime.

It is a super-2 number, since 2×1495621573981² (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 (1495621573921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 747810786990 + 747810786991.

It is an arithmetic number, because the mean of its divisors is an integer number (747810786991).

Almost surely, 2^{1495621573981} is an apocalyptic number.

It is an amenable number.

1495621573981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1495621573981 is an equidigital number, since it uses as much as digits as its factorization.

1495621573981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16329600, while the sum is 61.

It can be divided in two parts, 1495621 and 573981, that added together give a palindrome (2069602).

The spelling of 1495621573981 in words is "one trillion, four hundred ninety-five billion, six hundred twenty-one million, five hundred seventy-three thousand, nine hundred eighty-one".