161213604 has 24 divisors (see below), whose sum is σ = 376400640. Its totient is φ = 53704224.

The previous prime is 161213593. The next prime is 161213627. The reversal of 161213604 is 406312161.

It is a super-2 number, since 2×161213604² = 51979652229337632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22582 + ... + 28850.

It is an arithmetic number, because the mean of its divisors is an integer number (15683360).

Almost surely, 2^161213604 is an apocalyptic number.

It is an amenable number.

161213604 is an abundant number, since it is smaller than the sum of its proper divisors (215187036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161213604 is a wasteful number, since it uses less digits than its factorization.

161213604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8419 (or 8417 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 161213604 is about 12696.9919272243. The cubic root of 161213604 is about 544.2526625123.

Adding to 161213604 its reverse (406312161), we get a palindrome (567525765).

The spelling of 161213604 in words is "one hundred sixty-one million, two hundred thirteen thousand, six hundred four".