1521973 has 2 divisors, whose sum is σ = 1521974. Its totient is φ = 1521972.

The previous prime is 1521937. The next prime is 1521983. The reversal of 1521973 is 3791251.

Together with previous prime (1521937) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1495729 + 26244 = 1223^2 + 162^2 .

It is a cyclic number.

It is not a de Polignac number, because 1521973 - 2¹⁷ = 1390901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1521913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760986 + 760987.

It is an arithmetic number, because the mean of its divisors is an integer number (760987).

2^1521973 is an apocalyptic number.

It is an amenable number.

1521973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521973 is an equidigital number, since it uses as much as digits as its factorization.

1521973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 28.

The square root of 1521973 is about 1233.6826982656. The cubic root of 1521973 is about 115.0276682009.

The spelling of 1521973 in words is "one million, five hundred twenty-one thousand, nine hundred seventy-three".