161630797 has 4 divisors (see below), whose sum is σ = 163578240. Its totient is φ = 159683356.

The previous prime is 161630789. The next prime is 161630801. The reversal of 161630797 is 797036161.

It is a happy number.

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 161630797 - 2³ = 161630789 is a prime.

It is a super-2 number, since 2×161630797² = 52249029077710418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161640797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973597 + ... + 973762.

It is an arithmetic number, because the mean of its divisors is an integer number (40894560).

Almost surely, 2^161630797 is an apocalyptic number.

It is an amenable number.

161630797 is a deficient number, since it is larger than the sum of its proper divisors (1947443).

161630797 is an equidigital number, since it uses as much as digits as its factorization.

161630797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947442.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 161630797 is about 12713.4101247462. The cubic root of 161630797 is about 544.7217354562.

The spelling of 161630797 in words is "one hundred sixty-one million, six hundred thirty thousand, seven hundred ninety-seven".