61421231 has 4 divisors (see below), whose sum is σ = 62029464. Its totient is φ = 60813000.

The previous prime is 61421219. The next prime is 61421237. The reversal of 61421231 is 13212416.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61421231 is a prime.

It is a super-2 number, since 2×61421231² = 7545135235110722, 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 (61421237) 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, 303965 + ... + 304166.

It is an arithmetic number, because the mean of its divisors is an integer number (15507366).

Almost surely, 2^61421231 is an apocalyptic number.

61421231 is a deficient number, since it is larger than the sum of its proper divisors (608233).

61421231 is a wasteful number, since it uses less digits than its factorization.

61421231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608232.

The product of its digits is 288, while the sum is 20.

The square root of 61421231 is about 7837.1698335560. The cubic root of 61421231 is about 394.5537469548.

Adding to 61421231 its reverse (13212416), we get a palindrome (74633647).

The spelling of 61421231 in words is "sixty-one million, four hundred twenty-one thousand, two hundred thirty-one".