61127551 has 4 divisors (see below), whose sum is σ = 62129704. Its totient is φ = 60125400.

The previous prime is 61127543. The next prime is 61127581. The reversal of 61127551 is 15572116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61127551 - 2³ = 61127543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61127531) 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, 500985 + ... + 501106.

It is an arithmetic number, because the mean of its divisors is an integer number (15532426).

Almost surely, 2^61127551 is an apocalyptic number.

61127551 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

61127551 is a deficient number, since it is larger than the sum of its proper divisors (1002153).

61127551 is a wasteful number, since it uses less digits than its factorization.

61127551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002152.

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

The square root of 61127551 is about 7818.4110278240. The cubic root of 61127551 is about 393.9239011471.

Adding to 61127551 its reverse (15572116), we get a palindrome (76699667).

It can be divided in two parts, 6112755 and 1, that added together give a triangular number (6112756 = T₃₄₉₆).

The spelling of 61127551 in words is "sixty-one million, one hundred twenty-seven thousand, five hundred fifty-one".