997749143 has 2 divisors, whose sum is σ = 997749144. Its totient is φ = 997749142.

The previous prime is 997749097. The next prime is 997749199. The reversal of 997749143 is 341947799.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997749143 - 2¹⁴ = 997732759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997749443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498874571 + 498874572.

It is an arithmetic number, because the mean of its divisors is an integer number (498874572).

Almost surely, 2^997749143 is an apocalyptic number.

997749143 is a deficient number, since it is larger than the sum of its proper divisors (1).

997749143 is an equidigital number, since it uses as much as digits as its factorization.

997749143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 53.

The square root of 997749143 is about 31587.1673785416. The cubic root of 997749143 is about 999.2491506998.

The spelling of 997749143 in words is "nine hundred ninety-seven million, seven hundred forty-nine thousand, one hundred forty-three".