161051901 has 4 divisors (see below), whose sum is σ = 214735872. Its totient is φ = 107367932.

The previous prime is 161051879. The next prime is 161051903. The reversal of 161051901 is 109150161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161051901 - 2⁶ = 161051837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161051903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26841981 + ... + 26841986.

It is an arithmetic number, because the mean of its divisors is an integer number (53683968).

Almost surely, 2^161051901 is an apocalyptic number.

It is an amenable number.

161051901 is a deficient number, since it is larger than the sum of its proper divisors (53683971).

161051901 is an equidigital number, since it uses as much as digits as its factorization.

161051901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53683970.

The product of its (nonzero) digits is 270, while the sum is 24.

The square root of 161051901 is about 12690.6225615610. The cubic root of 161051901 is about 544.0706333548.

The spelling of 161051901 in words is "one hundred sixty-one million, fifty-one thousand, nine hundred one".