61290251 has 6 divisors (see below), whose sum is σ = 67368756. Its totient is φ = 55718300.

The previous prime is 61290233. The next prime is 61290269. The reversal of 61290251 is 15209216.

It is an interprime number because it is at equal distance from previous prime (61290233) and next prime (61290269).

It is not a de Polignac number, because 61290251 - 2¹⁴ = 61273867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61290251.

It is not an unprimeable number, because it can be changed into a prime (61290211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 253145 + ... + 253386.

It is an arithmetic number, because the mean of its divisors is an integer number (11228126).

Almost surely, 2^61290251 is an apocalyptic number.

61290251 is a deficient number, since it is larger than the sum of its proper divisors (6078505).

61290251 is a wasteful number, since it uses less digits than its factorization.

61290251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506553 (or 506542 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 61290251 is about 7828.8090409717. The cubic root of 61290251 is about 394.2730870635.

Adding to 61290251 its reverse (15209216), we get a palindrome (76499467).

The spelling of 61290251 in words is "sixty-one million, two hundred ninety thousand, two hundred fifty-one".