61524947 has 4 divisors (see below), whose sum is σ = 67118136. Its totient is φ = 55931760.

The previous prime is 61524943. The next prime is 61524973. The reversal of 61524947 is 74942516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61524947 - 2² = 61524943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61524947.

It is not an unprimeable number, because it can be changed into a prime (61524943) 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, 2796578 + ... + 2796599.

It is an arithmetic number, because the mean of its divisors is an integer number (16779534).

Almost surely, 2^61524947 is an apocalyptic number.

61524947 is a deficient number, since it is larger than the sum of its proper divisors (5593189).

61524947 is a wasteful number, since it uses less digits than its factorization.

61524947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5593188.

The product of its digits is 60480, while the sum is 38.

The square root of 61524947 is about 7843.7839720380. The cubic root of 61524947 is about 394.7757034561.

Subtracting 61524947 from its reverse (74942516), we obtain a square (13417569 = 3663²).

The spelling of 61524947 in words is "sixty-one million, five hundred twenty-four thousand, nine hundred forty-seven".