61551433 has 4 divisors (see below), whose sum is σ = 61637760. Its totient is φ = 61465108.

The previous prime is 61551419. The next prime is 61551437. The reversal of 61551433 is 33415516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61551433 - 2⁵ = 61551401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61551437) 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, 42085 + ... + 43522.

It is an arithmetic number, because the mean of its divisors is an integer number (15409440).

Almost surely, 2^61551433 is an apocalyptic number.

It is an amenable number.

61551433 is a deficient number, since it is larger than the sum of its proper divisors (86327).

61551433 is an equidigital number, since it uses as much as digits as its factorization.

61551433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86326.

The product of its digits is 5400, while the sum is 28.

The square root of 61551433 is about 7845.4721336577. The cubic root of 61551433 is about 394.8323445951.

Adding to 61551433 its reverse (33415516), we get a palindrome (94966949).

The spelling of 61551433 in words is "sixty-one million, five hundred fifty-one thousand, four hundred thirty-three".