360161981 has 4 divisors (see below), whose sum is σ = 361491264. Its totient is φ = 358832700.

The previous prime is 360161951. The next prime is 360161993. The reversal of 360161981 is 189161063.

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 a de Polignac number, because none of the positive numbers 2^k-360161981 is a prime.

It is a super-2 number, since 2×360161981² = 259433305115688722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (360161951) 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, 664235 + ... + 664776.

It is an arithmetic number, because the mean of its divisors is an integer number (90372816).

Almost surely, 2^360161981 is an apocalyptic number.

It is an amenable number.

360161981 is a deficient number, since it is larger than the sum of its proper divisors (1329283).

360161981 is a wasteful number, since it uses less digits than its factorization.

360161981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329282.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 360161981 is about 18977.9340551073. The cubic root of 360161981 is about 711.4853391839.

The spelling of 360161981 in words is "three hundred sixty million, one hundred sixty-one thousand, nine hundred eighty-one".