61124721 has 24 divisors (see below), whose sum is σ = 96492864. Its totient is φ = 33714240.

The previous prime is 61124699. The next prime is 61124743. The reversal of 61124721 is 12742116.

It is an interprime number because it is at equal distance from previous prime (61124699) and next prime (61124743).

It is not a de Polignac number, because 61124721 - 2¹⁰ = 61123697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61124691 and 61124700.

It is not an unprimeable number, because it can be changed into a prime (61124761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15931 + ... + 19391.

It is an arithmetic number, because the mean of its divisors is an integer number (4020536).

Almost surely, 2^61124721 is an apocalyptic number.

It is an amenable number.

61124721 is a deficient number, since it is larger than the sum of its proper divisors (35368143).

61124721 is a wasteful number, since it uses less digits than its factorization.

61124721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529 (or 3500 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 61124721 is about 7818.2300426631. The cubic root of 61124721 is about 393.9178219361.

Adding to 61124721 its reverse (12742116), we get a palindrome (73866837).

The spelling of 61124721 in words is "sixty-one million, one hundred twenty-four thousand, seven hundred twenty-one".