997400849 has 2 divisors, whose sum is σ = 997400850. Its totient is φ = 997400848.

The previous prime is 997400843. The next prime is 997400909. The reversal of 997400849 is 948004799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 851764225 + 145636624 = 29185^2 + 12068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997400849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997400797 and 997400806.

It is not a weakly prime, because it can be changed into another prime (997400843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498700424 + 498700425.

It is an arithmetic number, because the mean of its divisors is an integer number (498700425).

Almost surely, 2^997400849 is an apocalyptic number.

It is an amenable number.

997400849 is a deficient number, since it is larger than the sum of its proper divisors (1).

997400849 is an equidigital number, since it uses as much as digits as its factorization.

997400849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 997400849 is about 31581.6536774121. The cubic root of 997400849 is about 999.1328646269.

The spelling of 997400849 in words is "nine hundred ninety-seven million, four hundred thousand, eight hundred forty-nine".