161211398 has 8 divisors (see below), whose sum is σ = 244730808. Its totient is φ = 79634464.

The previous prime is 161211397. The next prime is 161211419. The reversal of 161211398 is 893112161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161211398² = 51978229690228808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161211397) 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 3 ways as a sum of consecutive naturals, for example, 485411 + ... + 485742.

It is an arithmetic number, because the mean of its divisors is an integer number (30591351).

Almost surely, 2^161211398 is an apocalyptic number.

161211398 is a deficient number, since it is larger than the sum of its proper divisors (83519410).

161211398 is an equidigital number, since it uses as much as digits as its factorization.

161211398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971238.

The product of its digits is 2592, while the sum is 32.

The square root of 161211398 is about 12696.9050559575. The cubic root of 161211398 is about 544.2501800360.

The spelling of 161211398 in words is "one hundred sixty-one million, two hundred eleven thousand, three hundred ninety-eight".