378961261 has 4 divisors (see below), whose sum is σ = 433098592. Its totient is φ = 324823932.

The previous prime is 378961259. The next prime is 378961277. The reversal of 378961261 is 162169873.

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, and also an emirpimes, since its reverse is a distinct semiprime: 162169873 = 109 ⋅1487797.

It is a cyclic number.

It is not a de Polignac number, because 378961261 - 2¹ = 378961259 is a prime.

It is a super-2 number, since 2×378961261² = 287223274677420242, 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 (378961201) 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, 27068655 + ... + 27068668.

It is an arithmetic number, because the mean of its divisors is an integer number (108274648).

Almost surely, 2^378961261 is an apocalyptic number.

It is an amenable number.

378961261 is a deficient number, since it is larger than the sum of its proper divisors (54137331).

378961261 is an equidigital number, since it uses as much as digits as its factorization.

378961261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54137330.

The product of its digits is 108864, while the sum is 43.

The square root of 378961261 is about 19466.9273641220. The cubic root of 378961261 is about 723.6550640846.

The spelling of 378961261 in words is "three hundred seventy-eight million, nine hundred sixty-one thousand, two hundred sixty-one".