997139941 has 4 divisors (see below), whose sum is σ = 1139588512. Its totient is φ = 854691372.

The previous prime is 997139929. The next prime is 997139951. The reversal of 997139941 is 149931799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 149931799 = 1721 ⋅87119.

It is a cyclic number.

It is not a de Polignac number, because 997139941 - 2²⁷ = 862922213 is a prime.

It is a super-3 number, since 3×997139941³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997139951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71224275 + ... + 71224288.

It is an arithmetic number, because the mean of its divisors is an integer number (284897128).

Almost surely, 2^997139941 is an apocalyptic number.

It is an amenable number.

997139941 is a deficient number, since it is larger than the sum of its proper divisors (142448571).

997139941 is a wasteful number, since it uses less digits than its factorization.

997139941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142448570.

The product of its digits is 551124, while the sum is 52.

The square root of 997139941 is about 31577.5227179081. The cubic root of 997139941 is about 999.0457366712.

The spelling of 997139941 in words is "nine hundred ninety-seven million, one hundred thirty-nine thousand, nine hundred forty-one".