61541638 has 4 divisors (see below), whose sum is σ = 92312460. Its totient is φ = 30770818.

The previous prime is 61541621. The next prime is 61541647. The reversal of 61541638 is 83614516.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15385408 + ... + 15385411.

It is an arithmetic number, because the mean of its divisors is an integer number (23078115).

Almost surely, 2^61541638 is an apocalyptic number.

61541638 is a deficient number, since it is larger than the sum of its proper divisors (30770822).

61541638 is a wasteful number, since it uses less digits than its factorization.

61541638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30770821.

The product of its digits is 17280, while the sum is 34.

The square root of 61541638 is about 7844.8478634069. The cubic root of 61541638 is about 394.8113995751.

The spelling of 61541638 in words is "sixty-one million, five hundred forty-one thousand, six hundred thirty-eight".