126151561 has 4 divisors (see below), whose sum is σ = 126295312. Its totient is φ = 126007812.

The previous prime is 126151549. The next prime is 126151567. The reversal of 126151561 is 165151621.

It is a happy number.

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 not a de Polignac number, because 126151561 - 2⁷ = 126151433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126151567) 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, 70551 + ... + 72316.

It is an arithmetic number, because the mean of its divisors is an integer number (31573828).

Almost surely, 2^126151561 is an apocalyptic number.

It is an amenable number.

126151561 is a deficient number, since it is larger than the sum of its proper divisors (143751).

126151561 is an equidigital number, since it uses as much as digits as its factorization.

126151561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143750.

The product of its digits is 1800, while the sum is 28.

The square root of 126151561 is about 11231.7211949015. The cubic root of 126151561 is about 501.5307236546.

The spelling of 126151561 in words is "one hundred twenty-six million, one hundred fifty-one thousand, five hundred sixty-one".