62561581 has 4 divisors (see below), whose sum is σ = 66241692. Its totient is φ = 58881472.

The previous prime is 62561573. The next prime is 62561617. The reversal of 62561581 is 18516526.

It is a happy number.

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 58293225 + 4268356 = 7635^2 + 2066^2 .

It is not a de Polignac number, because 62561581 - 2³ = 62561573 is a prime.

It is a super-2 number, since 2×62561581² = 7827902834439122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (62562581) 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, 1840030 + ... + 1840063.

It is an arithmetic number, because the mean of its divisors is an integer number (16560423).

Almost surely, 2^62561581 is an apocalyptic number.

It is an amenable number.

62561581 is a deficient number, since it is larger than the sum of its proper divisors (3680111).

62561581 is a wasteful number, since it uses less digits than its factorization.

62561581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680110.

The product of its digits is 14400, while the sum is 34.

The square root of 62561581 is about 7909.5879159410. The cubic root of 62561581 is about 396.9805585338.

The spelling of 62561581 in words is "sixty-two million, five hundred sixty-one thousand, five hundred eighty-one".