61800523 has 4 divisors (see below), whose sum is σ = 62073000. Its totient is φ = 61528048.

The previous prime is 61800509. The next prime is 61800539. The reversal of 61800523 is 32500816.

It is a happy number.

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 61800523 - 2²⁵ = 28246091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61800023) 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, 135898 + ... + 136351.

It is an arithmetic number, because the mean of its divisors is an integer number (15518250).

Almost surely, 2^61800523 is an apocalyptic number.

61800523 is a deficient number, since it is larger than the sum of its proper divisors (272477).

61800523 is a wasteful number, since it uses less digits than its factorization.

61800523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272476.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 61800523 is about 7861.3308669716. The cubic root of 61800523 is about 395.3642380782.

It can be divided in two parts, 61 and 800523, that multiplied together give a triangular number (48831903 = T₉₈₈₂).

The spelling of 61800523 in words is "sixty-one million, eight hundred thousand, five hundred twenty-three".