140634721 has 2 divisors, whose sum is σ = 140634722. Its totient is φ = 140634720.

The previous prime is 140634709. The next prime is 140634787. The reversal of 140634721 is 127436041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136072225 + 4562496 = 11665^2 + 2136^2 .

It is an emirp because it is prime and its reverse (127436041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140634721 - 2¹¹ = 140632673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140634721.

It is not a weakly prime, because it can be changed into another prime (140634821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70317360 + 70317361.

It is an arithmetic number, because the mean of its divisors is an integer number (70317361).

Almost surely, 2^140634721 is an apocalyptic number.

It is an amenable number.

140634721 is a deficient number, since it is larger than the sum of its proper divisors (1).

140634721 is an equidigital number, since it uses as much as digits as its factorization.

140634721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 140634721 is about 11858.9510918968. The cubic root of 140634721 is about 520.0329380023.

The spelling of 140634721 in words is "one hundred forty million, six hundred thirty-four thousand, seven hundred twenty-one".