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251402241 = 3697712011
BaseRepresentation
bin11101111110000…
…01100000000001
3122112001120001010
432333001200001
51003324332431
640540231133
76141612066
oct1677014001
9575046033
10251402241
11119a01252
127023b4a9
1340113a2c
1425562c6d
151710e846
hexefc1801

251402241 has 8 divisors (see below), whose sum is σ = 335278944. Its totient is φ = 167563520.

The previous prime is 251402237. The next prime is 251402257. The reversal of 251402241 is 142204152.

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 251402241 - 22 = 251402237 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251402441) 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, 14926 + ... + 26936.

It is an arithmetic number, because the mean of its divisors is an integer number (41909868).

Almost surely, 2251402241 is an apocalyptic number.

It is an amenable number.

251402241 is a deficient number, since it is larger than the sum of its proper divisors (83876703).

251402241 is a wasteful number, since it uses less digits than its factorization.

251402241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18991.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 251402241 is about 15855.6690492707. The cubic root of 251402241 is about 631.1361383237.

Adding to 251402241 its reverse (142204152), we get a palindrome (393606393).

The spelling of 251402241 in words is "two hundred fifty-one million, four hundred two thousand, two hundred forty-one".

Divisors: 1 3 6977 12011 20931 36033 83800747 251402241