61125821 has 4 divisors (see below), whose sum is σ = 61146144. Its totient is φ = 61105500.

The previous prime is 61125787. The next prime is 61125877. The reversal of 61125821 is 12852116.

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 61125821 - 2¹⁴ = 61109437 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 (61122821) 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, 4655 + ... + 11996.

It is an arithmetic number, because the mean of its divisors is an integer number (15286536).

Almost surely, 2^61125821 is an apocalyptic number.

It is an amenable number.

61125821 is a deficient number, since it is larger than the sum of its proper divisors (20323).

61125821 is a wasteful number, since it uses less digits than its factorization.

61125821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20322.

The product of its digits is 960, while the sum is 26.

The square root of 61125821 is about 7818.3003907499. The cubic root of 61125821 is about 393.9201849026.

Adding to 61125821 its reverse (12852116), we get a palindrome (73977937).

The spelling of 61125821 in words is "sixty-one million, one hundred twenty-five thousand, eight hundred twenty-one".