61144999 has 2 divisors, whose sum is σ = 61145000. Its totient is φ = 61144998.

The previous prime is 61144991. The next prime is 61145003. The reversal of 61144999 is 99944116.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61144999 - 2³ = 61144991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61144991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30572499 + 30572500.

It is an arithmetic number, because the mean of its divisors is an integer number (30572500).

Almost surely, 2^61144999 is an apocalyptic number.

61144999 is a deficient number, since it is larger than the sum of its proper divisors (1).

61144999 is an equidigital number, since it uses as much as digits as its factorization.

61144999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 61144999 is about 7819.5267759629. The cubic root of 61144999 is about 393.9613775947.

The spelling of 61144999 in words is "sixty-one million, one hundred forty-four thousand, nine hundred ninety-nine".