61540357 has 4 divisors (see below), whose sum is σ = 65160396. Its totient is φ = 57920320.

The previous prime is 61540351. The next prime is 61540403. The reversal of 61540357 is 75304516.

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 21585316 + 39955041 = 4646^2 + 6321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61540357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61540351) 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, 1809994 + ... + 1810027.

It is an arithmetic number, because the mean of its divisors is an integer number (16290099).

Almost surely, 2^61540357 is an apocalyptic number.

It is an amenable number.

61540357 is a deficient number, since it is larger than the sum of its proper divisors (3620039).

61540357 is a wasteful number, since it uses less digits than its factorization.

61540357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620038.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 61540357 is about 7844.7662170392. The cubic root of 61540357 is about 394.8086601999.

The spelling of 61540357 in words is "sixty-one million, five hundred forty thousand, three hundred fifty-seven".