61551233 has 2 divisors, whose sum is σ = 61551234. Its totient is φ = 61551232.

The previous prime is 61551227. The next prime is 61551263. The reversal of 61551233 is 33215516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60575089 + 976144 = 7783^2 + 988^2 .

It is a cyclic number.

It is not a de Polignac number, because 61551233 - 2⁸ = 61550977 is a prime.

It is not a weakly prime, because it can be changed into another prime (61551263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30775616 + 30775617.

It is an arithmetic number, because the mean of its divisors is an integer number (30775617).

Almost surely, 2^61551233 is an apocalyptic number.

It is an amenable number.

61551233 is a deficient number, since it is larger than the sum of its proper divisors (1).

61551233 is an equidigital number, since it uses as much as digits as its factorization.

61551233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 26.

The square root of 61551233 is about 7845.4593874419. The cubic root of 61551233 is about 394.8319169497.

Adding to 61551233 its reverse (33215516), we get a palindrome (94766749).

The spelling of 61551233 in words is "sixty-one million, five hundred fifty-one thousand, two hundred thirty-three".