361409861 has 8 divisors (see below), whose sum is σ = 375511800. Its totient is φ = 347417280.

The previous prime is 361409857. The next prime is 361409863. The reversal of 361409861 is 168904163.

It can be written as a sum of positive squares in 4 ways, for example, as 218152900 + 143256961 = 14770^2 + 11969^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 361409861 - 2² = 361409857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361409863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20570 + ... + 33851.

It is an arithmetic number, because the mean of its divisors is an integer number (46938975).

Almost surely, 2^361409861 is an apocalyptic number.

It is an amenable number.

361409861 is a deficient number, since it is larger than the sum of its proper divisors (14101939).

361409861 is a wasteful number, since it uses less digits than its factorization.

361409861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54679.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 361409861 is about 19010.7827561098. The cubic root of 361409861 is about 712.3061040462.

The spelling of 361409861 in words is "three hundred sixty-one million, four hundred nine thousand, eight hundred sixty-one".