61749553 has 4 divisors (see below), whose sum is σ = 61772788. Its totient is φ = 61726320.

The previous prime is 61749547. The next prime is 61749557. The reversal of 61749553 is 35594716.

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 60715264 + 1034289 = 7792^2 + 1017^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61749553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61749557) 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, 7026 + ... + 13147.

It is an arithmetic number, because the mean of its divisors is an integer number (15443197).

Almost surely, 2^61749553 is an apocalyptic number.

It is an amenable number.

61749553 is a deficient number, since it is larger than the sum of its proper divisors (23235).

61749553 is a wasteful number, since it uses less digits than its factorization.

61749553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23234.

The product of its digits is 113400, while the sum is 40.

The square root of 61749553 is about 7858.0883807705. The cubic root of 61749553 is about 395.2555159250.

The spelling of 61749553 in words is "sixty-one million, seven hundred forty-nine thousand, five hundred fifty-three".