997422725 has 48 divisors (see below), whose sum is σ = 1430189712. Its totient is φ = 683458560.

The previous prime is 997422683. The next prime is 997422731. The reversal of 997422725 is 527224799.

It is a happy number.

It is a Cunningham number, because it is equal to 31582²+1.

It can be written as a sum of positive squares in 24 ways, for example, as 525968356 + 471454369 = 22934^2 + 21713^2 .

It is not a de Polignac number, because 997422725 - 2⁶ = 997422661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 997422725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 402089 + ... + 404561.

It is an arithmetic number, because the mean of its divisors is an integer number (29795619).

Almost surely, 2^997422725 is an apocalyptic number.

It is an amenable number.

997422725 is a deficient number, since it is larger than the sum of its proper divisors (432766987).

997422725 is a wasteful number, since it uses less digits than its factorization.

997422725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586 (or 2581 counting only the distinct ones).

The product of its digits is 635040, while the sum is 47.

The square root of 997422725 is about 31582.0000158318. Note that the first 4 decimals coincide. The cubic root of 997422725 is about 999.1401692363.

The spelling of 997422725 in words is "nine hundred ninety-seven million, four hundred twenty-two thousand, seven hundred twenty-five".