61487513 has 4 divisors (see below), whose sum is σ = 61528320. Its totient is φ = 61446708.

The previous prime is 61487509. The next prime is 61487537. The reversal of 61487513 is 31578416.

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 61487513 - 2² = 61487509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61487593) 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, 18053 + ... + 21186.

It is an arithmetic number, because the mean of its divisors is an integer number (15382080).

Almost surely, 2^61487513 is an apocalyptic number.

It is an amenable number.

61487513 is a deficient number, since it is larger than the sum of its proper divisors (40807).

61487513 is a wasteful number, since it uses less digits than its factorization.

61487513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40806.

The product of its digits is 20160, while the sum is 35.

The square root of 61487513 is about 7841.3973882211. The cubic root of 61487513 is about 394.6956219467.

The spelling of 61487513 in words is "sixty-one million, four hundred eighty-seven thousand, five hundred thirteen".