61502221 has 8 divisors (see below), whose sum is σ = 70624800. Its totient is φ = 52968240.

The previous prime is 61502201. The next prime is 61502239. The reversal of 61502221 is 12220516.

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

It is a cyclic number.

It is not a de Polignac number, because 61502221 - 2⁷ = 61502093 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 (61502201) 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, 146926 + ... + 147343.

It is an arithmetic number, because the mean of its divisors is an integer number (8828100).

Almost surely, 2^61502221 is an apocalyptic number.

It is an amenable number.

61502221 is a deficient number, since it is larger than the sum of its proper divisors (9122579).

61502221 is a wasteful number, since it uses less digits than its factorization.

61502221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294299.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 61502221 is about 7842.3351751886. The cubic root of 61502221 is about 394.7270902352.

Adding to 61502221 its reverse (12220516), we get a palindrome (73722737).

The spelling of 61502221 in words is "sixty-one million, five hundred two thousand, two hundred twenty-one".