140634649 has 2 divisors, whose sum is σ = 140634650. Its totient is φ = 140634648.

The previous prime is 140634643. The next prime is 140634653. The reversal of 140634649 is 946436041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134096400 + 6538249 = 11580^2 + 2557^2 .

It is an emirp because it is prime and its reverse (946436041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140634649 - 2⁵ = 140634617 is a prime.

It is not a weakly prime, because it can be changed into another prime (140634643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70317324 + 70317325.

It is an arithmetic number, because the mean of its divisors is an integer number (70317325).

Almost surely, 2^140634649 is an apocalyptic number.

It is an amenable number.

140634649 is a deficient number, since it is larger than the sum of its proper divisors (1).

140634649 is an equidigital number, since it uses as much as digits as its factorization.

140634649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 140634649 is about 11858.9480562148. The cubic root of 140634649 is about 520.0328492562.

The spelling of 140634649 in words is "one hundred forty million, six hundred thirty-four thousand, six hundred forty-nine".