161422401 has 16 divisors (see below), whose sum is σ = 246218624. Its totient is φ = 92150784.

The previous prime is 161422399. The next prime is 161422403. The reversal of 161422401 is 104224161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161422399) and next prime (161422403).

It is not a de Polignac number, because 161422401 - 2¹ = 161422399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161422403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22305 + ... + 28641.

It is an arithmetic number, because the mean of its divisors is an integer number (15388664).

Almost surely, 2^161422401 is an apocalyptic number.

It is an amenable number.

161422401 is a deficient number, since it is larger than the sum of its proper divisors (84796223).

161422401 is a wasteful number, since it uses less digits than its factorization.

161422401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7560.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 161422401 is about 12705.2115684864. The cubic root of 161422401 is about 544.4875254432.

Adding to 161422401 its reverse (104224161), we get a palindrome (265646562).

The spelling of 161422401 in words is "one hundred sixty-one million, four hundred twenty-two thousand, four hundred one".