1522981973 has 4 divisors (see below), whose sum is σ = 1540094220. Its totient is φ = 1505869728.

The previous prime is 1522981969. The next prime is 1522981979. The reversal of 1522981973 is 3791892251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3791892251 = 7 ⋅541698893.

It can be written as a sum of positive squares in 2 ways, for example, as 1045034929 + 477947044 = 32327^2 + 21862^2 .

It is a cyclic number.

It is not a de Polignac number, because 1522981973 - 2² = 1522981969 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1522981979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8555990 + ... + 8556167.

It is an arithmetic number, because the mean of its divisors is an integer number (385023555).

Almost surely, 2^1522981973 is an apocalyptic number.

It is an amenable number.

1522981973 is a deficient number, since it is larger than the sum of its proper divisors (17112247).

1522981973 is an equidigital number, since it uses as much as digits as its factorization.

1522981973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17112246.

The product of its digits is 272160, while the sum is 47.

The square root of 1522981973 is about 39025.4016379076. The cubic root of 1522981973 is about 1150.5308130485.

The spelling of 1522981973 in words is "one billion, five hundred twenty-two million, nine hundred eighty-one thousand, nine hundred seventy-three".