997749061 has 2 divisors, whose sum is σ = 997749062. Its totient is φ = 997749060.

The previous prime is 997749029. The next prime is 997749097. The reversal of 997749061 is 160947799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 899640036 + 98109025 = 29994^2 + 9905^2 .

It is an emirp because it is prime and its reverse (160947799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997749061 - 2⁵ = 997749029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997779061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498874530 + 498874531.

It is an arithmetic number, because the mean of its divisors is an integer number (498874531).

Almost surely, 2^997749061 is an apocalyptic number.

It is an amenable number.

997749061 is a deficient number, since it is larger than the sum of its proper divisors (1).

997749061 is an equidigital number, since it uses as much as digits as its factorization.

997749061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 997749061 is about 31587.1660805461. The cubic root of 997749061 is about 999.2491233253.

The spelling of 997749061 in words is "nine hundred ninety-seven million, seven hundred forty-nine thousand, sixty-one".