61620549 has 8 divisors (see below), whose sum is σ = 82574400. Its totient is φ = 40873536.

The previous prime is 61620547. The next prime is 61620593. The reversal of 61620549 is 94502616.

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

It is not a de Polignac number, because 61620549 - 2¹ = 61620547 is a prime.

It is a super-2 number, since 2×61620549² = 7594184118122802, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61620547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51012 + ... + 52205.

It is an arithmetic number, because the mean of its divisors is an integer number (10321800).

Almost surely, 2^61620549 is an apocalyptic number.

It is an amenable number.

61620549 is a deficient number, since it is larger than the sum of its proper divisors (20953851).

61620549 is a wasteful number, since it uses less digits than its factorization.

61620549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103419.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 61620549 is about 7849.8757315005. The cubic root of 61620549 is about 394.9800748375.

The spelling of 61620549 in words is "sixty-one million, six hundred twenty thousand, five hundred forty-nine".