997905473 has 2 divisors, whose sum is σ = 997905474. Its totient is φ = 997905472.

The previous prime is 997905463. The next prime is 997905499. The reversal of 997905473 is 374509799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 606538384 + 391367089 = 24628^2 + 19783^2 .

It is a cyclic number.

It is not a de Polignac number, because 997905473 - 2¹⁰ = 997904449 is a prime.

It is not a weakly prime, because it can be changed into another prime (997905413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498952736 + 498952737.

It is an arithmetic number, because the mean of its divisors is an integer number (498952737).

Almost surely, 2^997905473 is an apocalyptic number.

It is an amenable number.

997905473 is a deficient number, since it is larger than the sum of its proper divisors (1).

997905473 is an equidigital number, since it uses as much as digits as its factorization.

997905473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2143260, while the sum is 53.

The square root of 997905473 is about 31589.6418624840. The cubic root of 997905473 is about 999.3013363161.

The spelling of 997905473 in words is "nine hundred ninety-seven million, nine hundred five thousand, four hundred seventy-three".