61551172 has 6 divisors (see below), whose sum is σ = 107714558. Its totient is φ = 30775584.

The previous prime is 61551167. The next prime is 61551173. The reversal of 61551172 is 27115516.

It can be written as a sum of positive squares in only one way, i.e., 32649796 + 28901376 = 5714^2 + 5376^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61551172.

It is not an unprimeable number, because it can be changed into a prime (61551173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7693893 + ... + 7693900.

Almost surely, 2^61551172 is an apocalyptic number.

It is an amenable number.

61551172 is a deficient number, since it is larger than the sum of its proper divisors (46163386).

61551172 is a wasteful number, since it uses less digits than its factorization.

61551172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15387797 (or 15387795 counting only the distinct ones).

The product of its digits is 2100, while the sum is 28.

The square root of 61551172 is about 7845.4554998419. The cubic root of 61551172 is about 394.8317865177.

Adding to 61551172 its reverse (27115516), we get a palindrome (88666688).

The spelling of 61551172 in words is "sixty-one million, five hundred fifty-one thousand, one hundred seventy-two".