140061997 has 8 divisors (see below), whose sum is σ = 148681656. Its totient is φ = 131484672.

The previous prime is 140061991. The next prime is 140062001. The reversal of 140061997 is 799160041.

It can be written as a sum of positive squares in 4 ways, for example, as 35593156 + 104468841 = 5966^2 + 10221^2 .

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 140061997 - 2²³ = 131673389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140061991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3628 + ... + 17125.

It is an arithmetic number, because the mean of its divisors is an integer number (18585207).

Almost surely, 2^140061997 is an apocalyptic number.

140061997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

140061997 is a deficient number, since it is larger than the sum of its proper divisors (8619659).

140061997 is a wasteful number, since it uses less digits than its factorization.

140061997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21167.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 140061997 is about 11834.7791276390. The cubic root of 140061997 is about 519.3260462683.

The spelling of 140061997 in words is "one hundred forty million, sixty-one thousand, nine hundred ninety-seven".