161621283 has 4 divisors (see below), whose sum is σ = 215495048. Its totient is φ = 107747520.

The previous prime is 161621279. The next prime is 161621287. The reversal of 161621283 is 382126161.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (161621279) and next prime (161621287).

It is not a de Polignac number, because 161621283 - 2² = 161621279 is a prime.

It is a super-2 number, since 2×161621283² = 52242878237132178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161621283.

It is not an unprimeable number, because it can be changed into a prime (161621287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26936878 + ... + 26936883.

It is an arithmetic number, because the mean of its divisors is an integer number (53873762).

Almost surely, 2^161621283 is an apocalyptic number.

161621283 is a deficient number, since it is larger than the sum of its proper divisors (53873765).

161621283 is an equidigital number, since it uses as much as digits as its factorization.

161621283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53873764.

The product of its digits is 3456, while the sum is 30.

The square root of 161621283 is about 12713.0359474045. The cubic root of 161621283 is about 544.7110473440.

The spelling of 161621283 in words is "one hundred sixty-one million, six hundred twenty-one thousand, two hundred eighty-three".