61563493 has 4 divisors (see below), whose sum is σ = 61827948. Its totient is φ = 61299040.

The previous prime is 61563473. The next prime is 61563503. The reversal of 61563493 is 39436516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44116164 + 17447329 = 6642^2 + 4177^2 .

It is a cyclic number.

It is not a de Polignac number, because 61563493 - 2²⁵ = 28009061 is a prime.

It is a super-2 number, since 2×61563493² = 7580127340722098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61563473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131878 + ... + 132343.

It is an arithmetic number, because the mean of its divisors is an integer number (15456987).

Almost surely, 2^61563493 is an apocalyptic number.

It is an amenable number.

61563493 is a deficient number, since it is larger than the sum of its proper divisors (264455).

61563493 is a wasteful number, since it uses less digits than its factorization.

61563493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264454.

The product of its digits is 58320, while the sum is 37.

The square root of 61563493 is about 7846.2406922041. The cubic root of 61563493 is about 394.8581298984.

The spelling of 61563493 in words is "sixty-one million, five hundred sixty-three thousand, four hundred ninety-three".