61897563 has 24 divisors (see below), whose sum is σ = 110041568. Its totient is φ = 32648832.

The previous prime is 61897553. The next prime is 61897567. The reversal of 61897563 is 36579816.

It is a happy number.

61897563 is a `hidden beast` number, since 6 + 1 + 89 + 7 + 563 = 666.

It is not a de Polignac number, because 61897563 - 2¹⁰ = 61896539 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (61897567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36970 + ... + 38607.

Almost surely, 2^61897563 is an apocalyptic number.

61897563 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

61897563 is a deficient number, since it is larger than the sum of its proper divisors (48144005).

61897563 is a wasteful number, since it uses less digits than its factorization.

61897563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75603 (or 75600 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 61897563 is about 7867.5004289800. The cubic root of 61897563 is about 395.5710652500.

The spelling of 61897563 in words is "sixty-one million, eight hundred ninety-seven thousand, five hundred sixty-three".