61370521 has 4 divisors (see below), whose sum is σ = 61513344. Its totient is φ = 61227700.

The previous prime is 61370497. The next prime is 61370537. The reversal of 61370521 is 12507316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61370521 - 2⁵ = 61370489 is a prime.

It is a super-2 number, since 2×61370521² = 7532681695622882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61370021) 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, 70765 + ... + 71626.

It is an arithmetic number, because the mean of its divisors is an integer number (15378336).

Almost surely, 2^61370521 is an apocalyptic number.

It is an amenable number.

61370521 is a deficient number, since it is larger than the sum of its proper divisors (142823).

61370521 is a wasteful number, since it uses less digits than its factorization.

61370521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142822.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 61370521 is about 7833.9339415137. The cubic root of 61370521 is about 394.4451345150.

Adding to 61370521 its reverse (12507316), we get a palindrome (73877837).

The spelling of 61370521 in words is "sixty-one million, three hundred seventy thousand, five hundred twenty-one".