61405263 has 8 divisors (see below), whose sum is σ = 90970800. Its totient is φ = 40936824.

The previous prime is 61405243. The next prime is 61405277. The reversal of 61405263 is 36250416.

It is not a de Polignac number, because 61405263 - 2²⁴ = 44628047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2274269 = 61405263 / (6 + 1 + 4 + 0 + 5 + 2 + 6 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61405213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1137108 + ... + 1137161.

It is an arithmetic number, because the mean of its divisors is an integer number (11371350).

Almost surely, 2^61405263 is an apocalyptic number.

61405263 is a deficient number, since it is larger than the sum of its proper divisors (29565537).

61405263 is a wasteful number, since it uses less digits than its factorization.

61405263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2274278 (or 2274272 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 61405263 is about 7836.1510322351. The cubic root of 61405263 is about 394.5195525881.

Adding to 61405263 its reverse (36250416), we get a palindrome (97655679).

The spelling of 61405263 in words is "sixty-one million, four hundred five thousand, two hundred sixty-three".