61578903 has 4 divisors (see below), whose sum is σ = 82105208. Its totient is φ = 41052600.

The previous prime is 61578893. The next prime is 61578917. The reversal of 61578903 is 30987516.

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

It is not a de Polignac number, because 61578903 - 2¹⁷ = 61447831 is a prime.

It is a super-2 number, since 2×61578903² = 7583922589366818, 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 (61578953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10263148 + ... + 10263153.

It is an arithmetic number, because the mean of its divisors is an integer number (20526302).

Almost surely, 2^61578903 is an apocalyptic number.

61578903 is a deficient number, since it is larger than the sum of its proper divisors (20526305).

61578903 is a wasteful number, since it uses less digits than its factorization.

61578903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20526304.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 61578903 is about 7847.2226296952. Note that the first 3 decimals coincide. The cubic root of 61578903 is about 394.8910728860.

It can be divided in two parts, 61578 and 903, that added together give a triangular number (62481 = T₃₅₃).

The spelling of 61578903 in words is "sixty-one million, five hundred seventy-eight thousand, nine hundred three".