61221733 has 4 divisors (see below), whose sum is σ = 62714988. Its totient is φ = 59728480.

The previous prime is 61221701. The next prime is 61221749. The reversal of 61221733 is 33712216.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4941729 + 56280004 = 2223^2 + 7502^2 .

It is a cyclic number.

It is not a de Polignac number, because 61221733 - 2⁵ = 61221701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61221698 and 61221707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61221793) 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, 746566 + ... + 746647.

It is an arithmetic number, because the mean of its divisors is an integer number (15678747).

Almost surely, 2^61221733 is an apocalyptic number.

It is an amenable number.

61221733 is a deficient number, since it is larger than the sum of its proper divisors (1493255).

61221733 is a wasteful number, since it uses less digits than its factorization.

61221733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493254.

The product of its digits is 1512, while the sum is 25.

The square root of 61221733 is about 7824.4318004568. The cubic root of 61221733 is about 394.1261094934.

Adding to 61221733 its reverse (33712216), we get a palindrome (94933949).

The spelling of 61221733 in words is "sixty-one million, two hundred twenty-one thousand, seven hundred thirty-three".