261740554 has 4 divisors (see below), whose sum is σ = 392610834. Its totient is φ = 130870276.

The previous prime is 261740543. The next prime is 261740639. The reversal of 261740554 is 455047162.

261740554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 455047162 = 2 ⋅227523581.

It can be written as a sum of positive squares in only one way, i.e., 247338529 + 14402025 = 15727^2 + 3795^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65435137 + ... + 65435140.

Almost surely, 2^261740554 is an apocalyptic number.

261740554 is a deficient number, since it is larger than the sum of its proper divisors (130870280).

261740554 is a wasteful number, since it uses less digits than its factorization.

261740554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130870279.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 261740554 is about 16178.3977575037. The cubic root of 261740554 is about 639.6715062270.

The spelling of 261740554 in words is "two hundred sixty-one million, seven hundred forty thousand, five hundred fifty-four".