1251422501 has 4 divisors (see below), whose sum is σ = 1430197152. Its totient is φ = 1072647852.

The previous prime is 1251422461. The next prime is 1251422521. The reversal of 1251422501 is 1052241521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1052241521 = 61 ⋅17249861.

It is a cyclic number.

It is not a de Polignac number, because 1251422501 - 2⁶ = 1251422437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251422521) 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, 89387315 + ... + 89387328.

It is an arithmetic number, because the mean of its divisors is an integer number (357549288).

Almost surely, 2^1251422501 is an apocalyptic number.

It is an amenable number.

1251422501 is a deficient number, since it is larger than the sum of its proper divisors (178774651).

1251422501 is an equidigital number, since it uses as much as digits as its factorization.

1251422501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178774650.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1251422501 is about 35375.4505413005. The cubic root of 1251422501 is about 1077.6258148422.

The spelling of 1251422501 in words is "one billion, two hundred fifty-one million, four hundred twenty-two thousand, five hundred one".