61220413 has 8 divisors (see below), whose sum is σ = 64736000. Its totient is φ = 57734208.

The previous prime is 61220407. The next prime is 61220473. The reversal of 61220413 is 31402216.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61220413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61220473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2988 + ... + 11461.

It is an arithmetic number, because the mean of its divisors is an integer number (8092000).

Almost surely, 2^61220413 is an apocalyptic number.

It is an amenable number.

61220413 is a deficient number, since it is larger than the sum of its proper divisors (3515587).

61220413 is a wasteful number, since it uses less digits than its factorization.

61220413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14691.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 61220413 is about 7824.3474488292. The cubic root of 61220413 is about 394.1232768925.

Adding to 61220413 its reverse (31402216), we get a palindrome (92622629).

It can be divided in two parts, 612 and 20413, that added together give a square (21025 = 145²).

The spelling of 61220413 in words is "sixty-one million, two hundred twenty thousand, four hundred thirteen".