61103987 has 4 divisors (see below), whose sum is σ = 69833136. Its totient is φ = 52374840.

The previous prime is 61103953. The next prime is 61104013. The reversal of 61103987 is 78930116.

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

It is not a de Polignac number, because 61103987 - 2¹⁸ = 60841843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61103927) 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, 4364564 + ... + 4364577.

It is an arithmetic number, because the mean of its divisors is an integer number (17458284).

Almost surely, 2^61103987 is an apocalyptic number.

61103987 is a deficient number, since it is larger than the sum of its proper divisors (8729149).

61103987 is an equidigital number, since it uses as much as digits as its factorization.

61103987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8729148.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 61103987 is about 7816.9039267475. The cubic root of 61103987 is about 393.8732768614.

The spelling of 61103987 in words is "sixty-one million, one hundred three thousand, nine hundred eighty-seven".