61384531 has 4 divisors (see below), whose sum is σ = 66106432. Its totient is φ = 56662632.

The previous prime is 61384523. The next prime is 61384553. The reversal of 61384531 is 13548316.

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

It is not a de Polignac number, because 61384531 - 2³ = 61384523 is a prime.

It is a super-2 number, since 2×61384531² = 7536121292179922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 61384493 and 61384502.

It is not an unprimeable number, because it can be changed into a prime (61384571) 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, 2360931 + ... + 2360956.

It is an arithmetic number, because the mean of its divisors is an integer number (16526608).

Almost surely, 2^61384531 is an apocalyptic number.

61384531 is a deficient number, since it is larger than the sum of its proper divisors (4721901).

61384531 is a wasteful number, since it uses less digits than its factorization.

61384531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4721900.

The product of its digits is 8640, while the sum is 31.

The square root of 61384531 is about 7834.8280772459. The cubic root of 61384531 is about 394.4751475994.

The spelling of 61384531 in words is "sixty-one million, three hundred eighty-four thousand, five hundred thirty-one".