61563207 has 4 divisors (see below), whose sum is σ = 82084280. Its totient is φ = 41042136.

The previous prime is 61563193. The next prime is 61563217. The reversal of 61563207 is 70236516.

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

It is not a de Polignac number, because 61563207 - 2⁸ = 61562951 is a prime.

It is a super-2 number, since 2×61563207² = 7580056912249698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61563217) 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, 10260532 + ... + 10260537.

It is an arithmetic number, because the mean of its divisors is an integer number (20521070).

Almost surely, 2^61563207 is an apocalyptic number.

61563207 is a deficient number, since it is larger than the sum of its proper divisors (20521073).

61563207 is a wasteful number, since it uses less digits than its factorization.

61563207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20521072.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 61563207 is about 7846.2224668945. Note that the first 3 decimals coincide. The cubic root of 61563207 is about 394.8575184452.

The spelling of 61563207 in words is "sixty-one million, five hundred sixty-three thousand, two hundred seven".