61009551 has 16 divisors (see below), whose sum is σ = 95142400. Its totient is φ = 38532024.

The previous prime is 61009541. The next prime is 61009601. The reversal of 61009551 is 15590016.

61009551 is a `hidden beast` number, since 6 + 100 + 9 + 551 = 666.

It is not a de Polignac number, because 61009551 - 2¹⁴ = 60993167 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61009511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58951 + ... + 59976.

It is an arithmetic number, because the mean of its divisors is an integer number (5946400).

Almost surely, 2^61009551 is an apocalyptic number.

61009551 is a deficient number, since it is larger than the sum of its proper divisors (34132849).

61009551 is a wasteful number, since it uses less digits than its factorization.

61009551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118955 (or 118949 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 61009551 is about 7810.8610920948. The cubic root of 61009551 is about 393.6702623116.

Adding to 61009551 its reverse (15590016), we get a palindrome (76599567).

It can be divided in two parts, 6100 and 9551, that added together give a palindrome (15651).

The spelling of 61009551 in words is "sixty-one million, nine thousand, five hundred fifty-one".