161440051 has 8 divisors (see below), whose sum is σ = 164077200. Its totient is φ = 158809728.

The previous prime is 161440031. The next prime is 161440073. The reversal of 161440051 is 150044161.

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 161440051 - 2²¹ = 159342899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161440031) 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, 69135 + ... + 71431.

It is an arithmetic number, because the mean of its divisors is an integer number (20509650).

Almost surely, 2^161440051 is an apocalyptic number.

161440051 is a deficient number, since it is larger than the sum of its proper divisors (2637149).

161440051 is a wasteful number, since it uses less digits than its factorization.

161440051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3413.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 161440051 is about 12705.9061463557. The cubic root of 161440051 is about 544.5073695592.

The spelling of 161440051 in words is "one hundred sixty-one million, four hundred forty thousand, fifty-one".