61311553 has 8 divisors (see below), whose sum is σ = 63858240. Its totient is φ = 58811760.

The previous prime is 61311541. The next prime is 61311559. The reversal of 61311553 is 35511316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61311553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61311559) 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, 9043 + ... + 14296.

It is an arithmetic number, because the mean of its divisors is an integer number (7982280).

Almost surely, 2^61311553 is an apocalyptic number.

It is an amenable number.

61311553 is a deficient number, since it is larger than the sum of its proper divisors (2546687).

61311553 is a wasteful number, since it uses less digits than its factorization.

61311553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23447.

The product of its digits is 1350, while the sum is 25.

The square root of 61311553 is about 7830.1694106833. The cubic root of 61311553 is about 394.3187595390.

Adding to 61311553 its reverse (35511316), we get a palindrome (96822869).

The spelling of 61311553 in words is "sixty-one million, three hundred eleven thousand, five hundred fifty-three".