61331407 has 2 divisors, whose sum is σ = 61331408. Its totient is φ = 61331406.

The previous prime is 61331399. The next prime is 61331429. The reversal of 61331407 is 70413316.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61331407 - 2³ = 61331399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61331507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30665703 + 30665704.

It is an arithmetic number, because the mean of its divisors is an integer number (30665704).

Almost surely, 2^61331407 is an apocalyptic number.

61331407 is a deficient number, since it is larger than the sum of its proper divisors (1).

61331407 is an equidigital number, since it uses as much as digits as its factorization.

61331407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 61331407 is about 7831.4370967275. The cubic root of 61331407 is about 394.3613179116.

The spelling of 61331407 in words is "sixty-one million, three hundred thirty-one thousand, four hundred seven".