61002551 has 4 divisors (see below), whose sum is σ = 61050672. Its totient is φ = 60954432.

The previous prime is 61002541. The next prime is 61002553. The reversal of 61002551 is 15520016.

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

It is a cyclic number.

It is not a de Polignac number, because 61002551 - 2¹⁰ = 61001527 is a prime.

It is a super-2 number, since 2×61002551² = 7442622457015202, 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 (61002553) 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, 22106 + ... + 24711.

It is an arithmetic number, because the mean of its divisors is an integer number (15262668).

Almost surely, 2^61002551 is an apocalyptic number.

61002551 is a deficient number, since it is larger than the sum of its proper divisors (48121).

61002551 is a wasteful number, since it uses less digits than its factorization.

61002551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48120.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 61002551 is about 7810.4129852396. The cubic root of 61002551 is about 393.6552056678.

Adding to 61002551 its reverse (15520016), we get a palindrome (76522567).

The spelling of 61002551 in words is "sixty-one million, two thousand, five hundred fifty-one".