999961497 has 8 divisors (see below), whose sum is σ = 1481424480. Its totient is φ = 666640980.

The previous prime is 999961477. The next prime is 999961511. The reversal of 999961497 is 794169999.

999961497 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 614 + 9 + 7 = 666.

It is not a de Polignac number, because 999961497 - 2⁶ = 999961433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999961477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18517779 + ... + 18517832.

It is an arithmetic number, because the mean of its divisors is an integer number (185178060).

Almost surely, 2^999961497 is an apocalyptic number.

It is an amenable number.

999961497 is a deficient number, since it is larger than the sum of its proper divisors (481462983).

999961497 is a wasteful number, since it uses less digits than its factorization.

999961497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37035620 (or 37035614 counting only the distinct ones).

The product of its digits is 9920232, while the sum is 63.

The square root of 999961497 is about 31622.1678099399. The cubic root of 999961497 is about 999.9871655019.

Adding to 999961497 its sum of digits (63), we get a triangular number (999961560 = T₄₄₇₂₀).

The spelling of 999961497 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, four hundred ninety-seven".