61981358 has 4 divisors (see below), whose sum is σ = 92972040. Its totient is φ = 30990678.

The previous prime is 61981349. The next prime is 61981373. The reversal of 61981358 is 85318916.

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, 15495338 + ... + 15495341.

It is an arithmetic number, because the mean of its divisors is an integer number (23243010).

Almost surely, 2^61981358 is an apocalyptic number.

61981358 is a deficient number, since it is larger than the sum of its proper divisors (30990682).

61981358 is a wasteful number, since it uses less digits than its factorization.

61981358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30990681.

The product of its digits is 51840, while the sum is 41.

The square root of 61981358 is about 7872.8240168316. The cubic root of 61981358 is about 395.7494887037.

The spelling of 61981358 in words is "sixty-one million, nine hundred eighty-one thousand, three hundred fifty-eight".