61214431 has 4 divisors (see below), whose sum is σ = 63875952. Its totient is φ = 58552912.

The previous prime is 61214423. The next prime is 61214437. The reversal of 61214431 is 13441216.

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 61214431 - 2³ = 61214423 is a prime.

It is a super-2 number, since 2×61214431² = 7494413125307522, 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 (61214437) 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, 1330726 + ... + 1330771.

It is an arithmetic number, because the mean of its divisors is an integer number (15968988).

Almost surely, 2^61214431 is an apocalyptic number.

61214431 is a deficient number, since it is larger than the sum of its proper divisors (2661521).

61214431 is a wasteful number, since it uses less digits than its factorization.

61214431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661520.

The product of its digits is 576, while the sum is 22.

The square root of 61214431 is about 7823.9651711904. The cubic root of 61214431 is about 394.1104395499.

Adding to 61214431 its reverse (13441216), we get a palindrome (74655647).

The spelling of 61214431 in words is "sixty-one million, two hundred fourteen thousand, four hundred thirty-one".