161140251 has 8 divisors (see below), whose sum is σ = 217880064. Its totient is φ = 105913640.

The previous prime is 161140249. The next prime is 161140261. The reversal of 161140251 is 152041161.

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 161140251 - 2¹ = 161140249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161140261) 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, 378051 + ... + 378476.

It is an arithmetic number, because the mean of its divisors is an integer number (27235008).

Almost surely, 2^161140251 is an apocalyptic number.

161140251 is a deficient number, since it is larger than the sum of its proper divisors (56739813).

161140251 is an equidigital number, since it uses as much as digits as its factorization.

161140251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756601.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 161140251 is about 12694.1030010001. The cubic root of 161140251 is about 544.1701040906.

The spelling of 161140251 in words is "one hundred sixty-one million, one hundred forty thousand, two hundred fifty-one".