251222690149 has 8 divisors (see below), whose sum is σ = 257085370080. Its totient is φ = 245360932656.

The previous prime is 251222690087. The next prime is 251222690209. The reversal of 251222690149 is 941096222152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251222690149 - 2¹⁹ = 251222165861 is a prime.

It is a super-2 number, since 2×251222690149² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251222699149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336522 + ... + 784660.

It is an arithmetic number, because the mean of its divisors is an integer number (32135671260).

Almost surely, 2^251222690149 is an apocalyptic number.

It is an amenable number.

251222690149 is a deficient number, since it is larger than the sum of its proper divisors (5862679931).

251222690149 is a wasteful number, since it uses less digits than its factorization.

251222690149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461219.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 251222690149 in words is "two hundred fifty-one billion, two hundred twenty-two million, six hundred ninety thousand, one hundred forty-nine".