140648261 has 8 divisors (see below), whose sum is σ = 151901400. Its totient is φ = 129457152.

The previous prime is 140648239. The next prime is 140648267. The reversal of 140648261 is 162846041.

It can be written as a sum of positive squares in 4 ways, for example, as 4202500 + 136445761 = 2050^2 + 11681^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140648261 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 (140648267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10736 + ... + 19913.

It is an arithmetic number, because the mean of its divisors is an integer number (18987675).

Almost surely, 2^140648261 is an apocalyptic number.

It is an amenable number.

140648261 is a deficient number, since it is larger than the sum of its proper divisors (11253139).

140648261 is a wasteful number, since it uses less digits than its factorization.

140648261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31015.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 140648261 is about 11859.5219549525. The cubic root of 140648261 is about 520.0496266739.

The spelling of 140648261 in words is "one hundred forty million, six hundred forty-eight thousand, two hundred sixty-one".