61294781 has 4 divisors (see below), whose sum is σ = 63272064. Its totient is φ = 59317500.

The previous prime is 61294771. The next prime is 61294787. The reversal of 61294781 is 18749216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61294781 is a prime.

It is a super-2 number, since 2×61294781² = 7514100355675922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61294787) 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, 988595 + ... + 988656.

It is an arithmetic number, because the mean of its divisors is an integer number (15818016).

Almost surely, 2^61294781 is an apocalyptic number.

It is an amenable number.

61294781 is a deficient number, since it is larger than the sum of its proper divisors (1977283).

61294781 is a wasteful number, since it uses less digits than its factorization.

61294781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977282.

The product of its digits is 24192, while the sum is 38.

The square root of 61294781 is about 7829.0983516622. The cubic root of 61294781 is about 394.2828004793.

The spelling of 61294781 in words is "sixty-one million, two hundred ninety-four thousand, seven hundred eighty-one".