261370619 has 4 divisors (see below), whose sum is σ = 266931744. Its totient is φ = 255809496.

The previous prime is 261370607. The next prime is 261370633. The reversal of 261370619 is 916073162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 916073162 = 2 ⋅458036581.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261370619 is a prime.

It is a super-2 number, since 2×261370619² = 136629200952886322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261370679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2780492 + ... + 2780585.

It is an arithmetic number, because the mean of its divisors is an integer number (66732936).

Almost surely, 2^261370619 is an apocalyptic number.

261370619 is a deficient number, since it is larger than the sum of its proper divisors (5561125).

261370619 is an equidigital number, since it uses as much as digits as its factorization.

261370619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561124.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 261370619 is about 16166.9607224116. The cubic root of 261370619 is about 639.3700009802.

The spelling of 261370619 in words is "two hundred sixty-one million, three hundred seventy thousand, six hundred nineteen".