61220455 has 4 divisors (see below), whose sum is σ = 73464552. Its totient is φ = 48976360.

The previous prime is 61220407. The next prime is 61220473. The reversal of 61220455 is 55402216.

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

It is not a de Polignac number, because 61220455 - 2¹⁷ = 61089383 is a prime.

It is a super-2 number, since 2×61220455² = 7495888220814050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6122041 + ... + 6122050.

It is an arithmetic number, because the mean of its divisors is an integer number (18366138).

Almost surely, 2^61220455 is an apocalyptic number.

61220455 is a deficient number, since it is larger than the sum of its proper divisors (12244097).

61220455 is a wasteful number, since it uses less digits than its factorization.

61220455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12244096.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 61220455 is about 7824.3501327586. The cubic root of 61220455 is about 394.1233670213.

The spelling of 61220455 in words is "sixty-one million, two hundred twenty thousand, four hundred fifty-five".