997951061 has 2 divisors, whose sum is σ = 997951062. Its totient is φ = 997951060.

The previous prime is 997951049. The next prime is 997951063. The reversal of 997951061 is 160159799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966028561 + 31922500 = 31081^2 + 5650^2 .

It is a cyclic number.

It is not a de Polignac number, because 997951061 - 2¹⁴ = 997934677 is a prime.

Together with 997951063, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 997950997 and 997951015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997951063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498975530 + 498975531.

It is an arithmetic number, because the mean of its divisors is an integer number (498975531).

Almost surely, 2^997951061 is an apocalyptic number.

It is an amenable number.

997951061 is a deficient number, since it is larger than the sum of its proper divisors (1).

997951061 is an equidigital number, since it uses as much as digits as its factorization.

997951061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 47.

The square root of 997951061 is about 31590.3634198785. The cubic root of 997951061 is about 999.3165533404.

The spelling of 997951061 in words is "nine hundred ninety-seven million, nine hundred fifty-one thousand, sixty-one".