61401511 has 2 divisors, whose sum is σ = 61401512. Its totient is φ = 61401510.

The previous prime is 61401503. The next prime is 61401533. The reversal of 61401511 is 11510416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61401511 - 2³ = 61401503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61401311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30700755 + 30700756.

It is an arithmetic number, because the mean of its divisors is an integer number (30700756).

Almost surely, 2^61401511 is an apocalyptic number.

61401511 is a deficient number, since it is larger than the sum of its proper divisors (1).

61401511 is an equidigital number, since it uses as much as digits as its factorization.

61401511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 61401511 is about 7835.9116253312. The cubic root of 61401511 is about 394.5115170798.

Adding to 61401511 its reverse (11510416), we get a palindrome (72911927).

The spelling of 61401511 in words is "sixty-one million, four hundred one thousand, five hundred eleven".