261423716 has 6 divisors (see below), whose sum is σ = 457491510. Its totient is φ = 130711856.

The previous prime is 261423709. The next prime is 261423751. The reversal of 261423716 is 617324162.

It can be written as a sum of positive squares in only one way, i.e., 228130816 + 33292900 = 15104^2 + 5770^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32677961 + ... + 32677968.

It is an arithmetic number, because the mean of its divisors is an integer number (76248585).

Almost surely, 2^261423716 is an apocalyptic number.

It is an amenable number.

261423716 is a deficient number, since it is larger than the sum of its proper divisors (196067794).

261423716 is a wasteful number, since it uses less digits than its factorization.

261423716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65355933 (or 65355931 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 261423716 is about 16168.6027844090. The cubic root of 261423716 is about 639.4132936941.

Adding to 261423716 its reverse (617324162), we get a palindrome (878747878).

The spelling of 261423716 in words is "two hundred sixty-one million, four hundred twenty-three thousand, seven hundred sixteen".