997350139 has 2 divisors, whose sum is σ = 997350140. Its totient is φ = 997350138.

The previous prime is 997350113. The next prime is 997350143. The reversal of 997350139 is 931053799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997350139 - 2¹⁵ = 997317371 is a prime.

It is not a weakly prime, because it can be changed into another prime (997350839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498675069 + 498675070.

It is an arithmetic number, because the mean of its divisors is an integer number (498675070).

Almost surely, 2^997350139 is an apocalyptic number.

997350139 is a deficient number, since it is larger than the sum of its proper divisors (1).

997350139 is an equidigital number, since it uses as much as digits as its factorization.

997350139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 229635, while the sum is 46.

The square root of 997350139 is about 31580.8508276772. The cubic root of 997350139 is about 999.1159316535.

The spelling of 997350139 in words is "nine hundred ninety-seven million, three hundred fifty thousand, one hundred thirty-nine".