61261205 has 8 divisors (see below), whose sum is σ = 73567032. Its totient is φ = 48973248.

The previous prime is 61261199. The next prime is 61261219. The reversal of 61261205 is 50216216.

It can be written as a sum of positive squares in 4 ways, for example, as 6959044 + 54302161 = 2638^2 + 7369^2 .

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 61261205 - 2⁸ = 61260949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4847 + ... + 12083.

It is an arithmetic number, because the mean of its divisors is an integer number (9195879).

Almost surely, 2^61261205 is an apocalyptic number.

It is an amenable number.

61261205 is a deficient number, since it is larger than the sum of its proper divisors (12305827).

61261205 is a wasteful number, since it uses less digits than its factorization.

61261205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8935.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 61261205 is about 7826.9537497036. The cubic root of 61261205 is about 394.2107940372.

The spelling of 61261205 in words is "sixty-one million, two hundred sixty-one thousand, two hundred five".