997149131 has 8 divisors (see below), whose sum is σ = 1122889728. Its totient is φ = 877257000.

The previous prime is 997149073. The next prime is 997149163. The reversal of 997149131 is 131941799.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997149131 - 2⁶ = 997149067 is a prime.

It is a super-2 number, since 2×997149131² = 1988612778908110322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997149191) 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 7 ways as a sum of consecutive naturals, for example, 1461755 + ... + 1462436.

It is an arithmetic number, because the mean of its divisors is an integer number (140361216).

Almost surely, 2^997149131 is an apocalyptic number.

997149131 is a deficient number, since it is larger than the sum of its proper divisors (125740597).

997149131 is a wasteful number, since it uses less digits than its factorization.

997149131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924233.

The product of its digits is 61236, while the sum is 44.

The square root of 997149131 is about 31577.6682324709. The cubic root of 997149131 is about 999.0488058499.

The spelling of 997149131 in words is "nine hundred ninety-seven million, one hundred forty-nine thousand, one hundred thirty-one".