1225121510 has 16 divisors (see below), whose sum is σ = 2206686672. Its totient is φ = 489722400.

The previous prime is 1225121483. The next prime is 1225121567. The reversal of 1225121510 is 151215221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24701 + ... + 55320.

It is an arithmetic number, because the mean of its divisors is an integer number (137917917).

Almost surely, 2^1225121510 is an apocalyptic number.

1225121510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1225121510 is a deficient number, since it is larger than the sum of its proper divisors (981565162).

1225121510 is a wasteful number, since it uses less digits than its factorization.

1225121510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81559.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1225121510 is about 35001.7358140993. The cubic root of 1225121510 is about 1070.0228574032.

Adding to 1225121510 its reverse (151215221), we get a palindrome (1376336731).

The spelling of 1225121510 in words is "one billion, two hundred twenty-five million, one hundred twenty-one thousand, five hundred ten".