61421507 has 16 divisors (see below), whose sum is σ = 72887040. Its totient is φ = 50642592.

The previous prime is 61421453. The next prime is 61421573. The reversal of 61421507 is 70512416.

It is not a de Polignac number, because 61421507 - 2¹⁸ = 61159363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61423507) 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, 89588 + ... + 90270.

It is an arithmetic number, because the mean of its divisors is an integer number (4555440).

Almost surely, 2^61421507 is an apocalyptic number.

61421507 is a deficient number, since it is larger than the sum of its proper divisors (11465533).

61421507 is a wasteful number, since it uses less digits than its factorization.

61421507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 61421507 is about 7837.1874419335. The cubic root of 61421507 is about 394.5543379376.

Subtracting 61421507 from its reverse (70512416), we obtain a palindrome (9090909).

The spelling of 61421507 in words is "sixty-one million, four hundred twenty-one thousand, five hundred seven".