61501577 has 4 divisors (see below), whose sum is σ = 61563540. Its totient is φ = 61439616.

The previous prime is 61501543. The next prime is 61501607. The reversal of 61501577 is 77510516.

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 14661241 + 46840336 = 3829^2 + 6844^2 .

It is a cyclic number.

It is not a de Polignac number, because 61501577 - 2¹² = 61497481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61501507) 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, 29468 + ... + 31485.

It is an arithmetic number, because the mean of its divisors is an integer number (15390885).

Almost surely, 2^61501577 is an apocalyptic number.

It is an amenable number.

61501577 is a deficient number, since it is larger than the sum of its proper divisors (61963).

61501577 is a wasteful number, since it uses less digits than its factorization.

61501577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61962.

The product of its (nonzero) digits is 7350, while the sum is 32.

The square root of 61501577 is about 7842.2941158822. The cubic root of 61501577 is about 394.7257124793.

The spelling of 61501577 in words is "sixty-one million, five hundred one thousand, five hundred seventy-seven".