140561817 has 16 divisors (see below), whose sum is σ = 209442240. Its totient is φ = 83110400.

The previous prime is 140561807. The next prime is 140561833. The reversal of 140561817 is 718165041.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 140561817 - 2¹⁰ = 140560793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (140561807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50592 + ... + 53297.

It is an arithmetic number, because the mean of its divisors is an integer number (13090140).

Almost surely, 2^140561817 is an apocalyptic number.

It is an amenable number.

140561817 is a deficient number, since it is larger than the sum of its proper divisors (68880423).

140561817 is a wasteful number, since it uses less digits than its factorization.

140561817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103944.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 140561817 is about 11855.8768971342. The cubic root of 140561817 is about 519.9430620596.

The spelling of 140561817 in words is "one hundred forty million, five hundred sixty-one thousand, eight hundred seventeen".