61251541 has 4 divisors (see below), whose sum is σ = 65963212. Its totient is φ = 56539872.

The previous prime is 61251529. The next prime is 61251557. The reversal of 61251541 is 14515216.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33108516 + 28143025 = 5754^2 + 5305^2 .

It is a cyclic number.

It is not a de Polignac number, because 61251541 - 2¹³ = 61243349 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 (61251511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2355816 + ... + 2355841.

It is an arithmetic number, because the mean of its divisors is an integer number (16490803).

Almost surely, 2^61251541 is an apocalyptic number.

It is an amenable number.

61251541 is a deficient number, since it is larger than the sum of its proper divisors (4711671).

61251541 is a wasteful number, since it uses less digits than its factorization.

61251541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4711670.

The product of its digits is 1200, while the sum is 25.

The square root of 61251541 is about 7826.3363715087. The cubic root of 61251541 is about 394.1900639332.

Adding to 61251541 its reverse (14515216), we get a palindrome (75766757).

The spelling of 61251541 in words is "sixty-one million, two hundred fifty-one thousand, five hundred forty-one".